Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f3482ad1036e7d…

MALICIOUS

PDF

77.1 KB Created: 2021-05-15 11:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4cd199ce4065d4a8eb45526c2d0ca42b SHA-1: 101f044e223d68b2a1ceb61aa1382dace86b3ad2 SHA-256: f1f3482ad1036e7d5fb4729f7a1e8261736e350561b8f12b248fbdc5be5c0a8f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://kuzutuzo.ru/strik?utm_term=anna+todd+after+book+1+read+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449419/normal_603af02d02948.pdfIn PDF document text
    • http://labapewuxumawix.iblogger.org/the_collector_2009_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_5fcf00272bf0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fda2fd8cd1db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexifenila.rf.gd/94692611935.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/where_to_buy_wahl_elite_pro_clippers.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_eb3c3b6174034538a8e17f61ffcb75e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/distribution_cost_in_balance_sheet.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_0db2e97e92b2418885a3fdc659e8eb06.pdf?index=trueIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_58a8e87306ee4de2bca098a282077388.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_6a53b91d13a141f090580c98e247473b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/the_war_begins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5a8a66-aa71-4c89-a2af-0b408674fbfc/58365291918.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_27cfd98c54cf4ed8ac5328423d10e218.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_642f60d79a264d158cbecfe472769410.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_87bcfabb72c9415dabdb673e74a90abb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bc49bd-0e05-47f4-a542-b42009469dc0/how_to_install_gimp_on_a_mac.pdfIn PDF document text
    • http://paxugevobudutis.epizy.com/hobart_a200_mixer_spec_sheet.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_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 4968 bytes
SHA-256: 56352d45a3c3e851eab71ff736467b7f3684103e24ac037e03ec03177b454947
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 10672 bytes
SHA-256: f08f83652a48f385cfd4ee475f654dde37328908ea12d94fb4a1090f35ebc03c

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