Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01aad9ceecb05d9…

MALICIOUS

PDF

79.9 KB Created: 2021-05-23 07:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b81fc948637e691121b96a7ac5f471b SHA-1: dae746b65625d35f8354a178cc8cdab20d6bcdb2 SHA-256: a01aad9ceecb05d9eba025430f74c326e3894252fbd7aaead46b38c50acaeb3b
156 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=who+is+the+greatest+author+of+all+time PDF link annotation
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/joratilam.pdfIn PDF document text
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/6957091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_606416ee8eb1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fd0910a34881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_604a742182efb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavobawum/35450188412.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/bogeri.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/97775292434.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/11804280366.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/how_and_when_to_review_the_written_health_and_safety_policy_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b5f671-37a0-42be-8ac8-b44970efa9e8/the_vegetarian_butcher_unilever_brasil.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/ray_dalio_book_principles_for_success.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8529aa28-9a6f-4af9-9bb5-59829d3b1484/kidde_kn-cosm-b_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/riwekunosarobu.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/canon_mp160_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df7469e-59d6-412b-b96a-e2f70f846a86/the_tin_forest_planning_year_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ce1b52-d6b5-4b05-930c-ce9dda9865a9/gre_practice_quantitative_section.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/canulas_orofaringeas.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/creo_parametric_2._0_free_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/bovelul.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/bombsquad_for_iphone_free.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_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 5196 bytes
SHA-256: 781e4120daebf5195e6daa40462d7a37bd1c03e2c6dd358bfc55e924b9f49180
font_01_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 10384 bytes
SHA-256: d8de3c21de93e0c557a32f76cea60fdf0d28ff86a7f37a76e20f17c0e84a0142

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