Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf372bc95c699c1…

MALICIOUS

PDF

71.4 KB Created: 2021-04-02 14:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e6612bdd1618eea59271a37af8ba65e7 SHA-1: 5aa4f8134309643eaf8e8802b60df615f698c35a SHA-256: fdf372bc95c699c136a1ae8552dd3d7bfbe57b9df2be0fbbdb223f3d5c34f377
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-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.
  • 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=saxon+math+intermediate+5+pdf+section+3 PDF link annotation
    • http://weareanonymous.org/bilasaxaz1et29.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/PhhieeP/secret_codes_for_samsung_phones.pdfIn PDF document text
    • https://tewenamizudeko.weebly.com/uploads/1/3/0/8/130873709/4770134.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/diVibQo/bca_buyer_support.pdfIn PDF document text
    • https://rewuxumo.weebly.com/uploads/1/3/4/5/134586949/dudewikib.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/oschhjb/fate_grand_order_shimosa_guide.pdfIn PDF document text
    • https://gijorumofe.weebly.com/uploads/1/3/4/7/134764035/6664142.pdfIn PDF document text
    • https://loxigiberojawi.weebly.com/uploads/1/3/4/7/134770663/4407863.pdfIn PDF document text
    • http://7lessons.fun/sobotta_anatomy_atlas_downloadf3udn.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/85jejfC/split_balls_3d_level_6.pdfIn PDF document text
    • http://mnatural.space/maze_s_end_deck_edhuqcb9.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/ibJZigC/62748188319.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8345ffb7-214d-47f0-9fb0-82d133d432fb/motorola_cp200_programming_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/albian_ajeti_scout_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4493f353-80f7-4045-95a0-42154d8f8136/the_bet_by_anton_chekhov_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9056b18-40df-424b-9452-b24ba8af40f2/ruger_blackhawk_elite_pellet_air_rifle_gun_.177.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/arm_knitting_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/debawipiwapuzepe.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/dinepikevaxixamutik.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 5824 bytes
SHA-256: 3c2620a54dd76a114dc722299c09ee6fe78c206bb3071d16f4363f288f002960
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 10392 bytes
SHA-256: b4070c35afb08852611fb21d475dfe78e6325d4e7ccfefb34c67b35e81461df7

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