Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf768d3eafc8560…

MALICIOUS

PDF

92.9 KB Created: 2021-04-08 07:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da9452c89fb9029b3a2ad805b3c6ecee SHA-1: 5ea578629a32c5e74e9d2031d5de69ba7b8f831f SHA-256: dcf768d3eafc856044a66dd44caf8015b2aefdefa86f3ef2258932184d16319d
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 0.9997

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://gimoguvi.ru/123?utm_term=rugrats+adventure+game++mac PDF link annotation
    • http://xiruzox.mygamesonline.org/sagavivadovopaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupuwulawe/Oqhbfge/scent_of_a_woman_trailer_deutsch.pdfIn PDF document text
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/naxudulesetumusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_605d19909af7a.pdfIn PDF document text
    • https://gafajabi.weebly.com/uploads/1/3/4/8/134880466/94ae23654b76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_600f6061f3908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5fdeeae0ebc9c.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/e3BXYwg/copper_prices_around_me.pdfIn PDF document text
    • https://cdn.sqhk.co/bodegife/Mhghiea/hepatitis_alcoholic_liver_disease.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/povijimum-tiwosedek-vaginomu-newuxuvebuji.pdfIn PDF document text
    • https://cdn.sqhk.co/dibadigodem/LljdjfE/kezakodetadusebedem.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/KaOtFjd/lizomukosirojuded.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/80a3066.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/wijili.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/m7ihB0H/paintball_gun_range.pdfIn PDF document text
    • http://fopekoriw.sportsontheweb.net/69295010272.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/667659987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_3192db31cdd646c69fbd3ae21c31e1fa.pdf?index=trueIn PDF document text
    • http://dezobod.onlinewebshop.net/ruworejifalobaw.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/eclipse_ide_manual.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_ba2d2af53afd4ff39e2a01ae19779cd7.pdf?index=trueIn 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_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 5296 bytes
SHA-256: ef8687f26bcd88d8ae64d5668de6e61113584257849e1d87440aa60da0a90e7a
font_01_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 11652 bytes
SHA-256: 36d8276c9cf1f3be389ad1d067445c32272c46e887fa70dab15574025fbc2eae

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