Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f004c41df31c07c…

MALICIOUS

PDF

96.3 KB Created: 2021-04-04 08:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ec8c4ec42acff583b3b452993e5d903 SHA-1: 51bf0796dbde3b1c2316efb7ac0de588c9c8939b SHA-256: 5f004c41df31c07c850d712ed0cd749aa13f7275d6bc52f9eed1e3d9f2f35b96
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://jottigo.ru/award?keyword=approaches+to+performance+management+pdf PDF link annotation
    • https://legoxadev.weebly.com/uploads/1/3/2/3/132302888/mederosilikur_womufowazixujo_notaxa_kosumuxut.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/949904.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/3741210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5fe1d8afc0f51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5ffb9545ded1c.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/navaletijekubibizer.pdfIn PDF document text
    • http://legexebe.medianewsonline.com/esl_business_english_conversation.pdfIn PDF document text
    • http://official-win.xyz/94069114442t3y48.pdfIn PDF document text
    • http://repair-foto.ru/tubulolovosewitivotodesolhcf8v.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/6616422.pdfIn PDF document text
    • https://nomexunasopil.weebly.com/uploads/1/3/4/4/134464396/9722632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_6006266716f3a.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/7c4e1b4e-3b95-4cb0-9e62-eedeade67e4a/what_was_the_purpose_of_letter_from_birmingham_jail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/706bb4ce-d5ee-43ab-b5e8-4200dfc25809/whats_after_juz_amma.pdfIn PDF document text
    • http://dijipola.onlinewebshop.net/88791256899.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/kuzojupofebujunuxapalozup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cc02b6-e6a8-4f75-af86-0dddfa1d5ca3/bell_hooks_all_about_love_excerpt.pdfIn PDF document text
    • http://juborekif.atwebpages.com/fahrenheit_451_part_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c79d015-dfe3-485c-839c-05da09b42399/can_you_use_thinkorswim_with_robinhood.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_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 5528 bytes
SHA-256: 832cd7f909c445e5cdcfde3057d944ed63b643924789531e74a1f0b881ef69d4
font_01_sfnt_off00014e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3E 11180 bytes
SHA-256: 66f51f55d556ab1fe8154267e6886f7cce4f5a7a242e0f7a80c4e23656545551

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