Malicious PDF — malware analysis report

Static analysis result for SHA-256 9808ba8844c4b1c7…

MALICIOUS

PDF

87.1 KB Created: 2021-03-29 05:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4bc3bc38b8523c24635244e22e3e9f17 SHA-1: 3322f70d434dea44193bc858d758387b325310bc SHA-256: 9808ba8844c4b1c7c6020d87557ae20ba81ecedd2f70d334bf28bb12fcaee1bb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/wix?keyword=tank+trouble+3.13 PDF link annotation
    • http://zhk-samolet-krasnodar.info/what_size_windshield_wipers_do_i_need_for_a_2012_ford_focusch8j4.pdfIn PDF document text
    • http://save50it.pro/wonoxekovuvulitumesijopunft46c.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://limecash.xyz/9911317420ybewp.pdfIn PDF document text
    • http://prechambre.xyz/wowivikfqn8.pdfIn PDF document text
    • http://draiwenstore.online/tiwewesolarub09.pdfIn PDF document text
    • http://organize.shop/kannada_challenging_star_darshan_photos89hr9.pdfIn PDF document text
    • http://iuts.space/how_to_adjust_2_stroke_engine_carburetorlrg4x.pdfIn PDF document text
    • http://coloradocustomelectric.com/lovikatiluevj7p.pdfIn PDF document text
    • http://nukicew.xyz/gasekaloxusobtzns.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_374f322a04074fdb92c14852345f82d2.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_275a57fce6cf46b689f53d15a67d48e4.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_58718079d4f144e99039c6f73c19fbed.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_7c180f306e4f47a6b2c0cd3cfd321311.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_c823cb684a544da492b0d072d92d4051.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_72de515d05ea4f05960719c20ec42c2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d05d653-8ece-4df4-aae8-256217faed34/thus_spoke_zarathustra_kaufmann_translation.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_fbcd5440e4d74ae6980981c310628310.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e60a16f-5ed6-49cb-83b6-5e5d3c2ffad0/john_deere_125_lawn_tractor_parts_diagram.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_f01eb326f0d343baa9989afddbb70bd7.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_19cc363e296741fd9f579dd34347c3e1.pdf?index=trueIn PDF document text
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_3de11e73b31247bda70102d7e9102baf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd260b7-e249-4cfe-b915-90d01e408bc7/freak_the_mighty_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0f7213-0d60-40e9-9391-f51b29c78dc8/i_am_malala_book_quotes_and_page_number.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 4904 bytes
SHA-256: 93a32b042cf8702ed727bc2721ece02a12e69aa25de1a6e4ffe90b733a8a0373
font_01_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 10440 bytes
SHA-256: 7c7a08c919b505f45e17fc0b69a7c15b68bebddcf07a8856545f8e485bcb11fd