Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3736b344b5a750…

MALICIOUS

PDF

78.8 KB Created: 2021-03-26 05:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 619b49bc6a897edfe80938a5cacb6027 SHA-1: a91eb45b52bea2d4cae79cb1c3f146fc8f066684 SHA-256: ac3736b344b5a75099485086cfbe5adf142cea44c512b5e8c31188163ae5289f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, and one primary URL that appears to be a search query for a book. This suggests a link farm or phishing attempt designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/award?keyword=after+we+collided+full+book+pdf+download PDF link annotation
    • http://tufepuwaw.iblogger.org/datofabesafepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_882ff4c4c15c443781f741b9ee59a715.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_17708a7db2444ca2a1333fb194fc884e.pdf?index=trueIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_1637c2e56fc141738a0262f8d4f4408d.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_d6fe8bbba74b457a92602c5a8c1b2373.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_51244a30201646dc8f9af63735d42b72.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_87e8cea7c6d8497aba80f287380e76e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d57bcef-2bcd-4e97-9c29-ab8233a3641d/77039899739.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_4b0b6169fccb4d24814f067094688398.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0982195e-914f-4ee6-891b-56f8f6a85c6b/91886428490.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_919d4b97753b4e2a8f351eda8dd9ded8.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_59b9c629c25749b3bcf710551c95abe3.pdf?index=trueIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_b204f90be9ec431896c689f0fb83ad1a.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_bd0a1fec665a4d33ba4e71c5d95bbe71.pdf?index=trueIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_ed06416bbf844b8bae8b866d9c34ee6f.pdf?index=trueIn PDF document text
    • http://pikididubemet.epizy.com/mizizabaguberilejitanek.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_38a45678c4794950b1384bdb663f643f.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_da0f6df0c04a4d6c8219944b7bef7dc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4bb653-6432-4871-9327-53a9b9cb1e8b/fabofazilugexab.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_baa05f63a72e4e51854fb7d4a005a5b8.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_33938f3e9cb2452699bbbc6a2d877f85.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_38f87702ea074788bf668b501d63edde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da1af80-8fd4-4c57-a619-ab4554ea40e8/huckleberry_finn_sparknotes_chapter_5-7.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_02bf7eff32fa4406867a2be041e1b655.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5136 bytes
SHA-256: 6e157c856a9681ed4c60bdcd07176f64a800033e5fe32c82fb0239fe7ebad6d5
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10716 bytes
SHA-256: 288d3e3e88ce89f43c5c7f97bf2eff2694120dd6a866068145e45e17fedff0ab
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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