Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa7f3dfce438f8a…

MALICIOUS

PDF

75.6 KB Created: 2021-06-09 15:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 332da8194e12da5e212cfdccdfd2695c SHA-1: 05ecb5594f046af9cba8b9493281c60b7382093d SHA-256: daa7f3dfce438f8a0977e1a556e23cebe13f00d6ed1351cb110d214d2ade783e
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://synerhu.ru/pbw?utm_term=thalattu+songs+for+babies+in+tamil+free+download PDF link annotation
    • https://kipofazusaf.weebly.com/uploads/1/3/1/3/131379409/2248971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_60badd02d3132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_602307600d9fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_60c09e28bd3e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2e8a38710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_600cff4b0f639.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/bowemodikinob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_5fd6f35155935.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/guziletudalobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdd01c3b34f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_601d6f1e61024.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/965cb3f8-8dfb-489e-881b-a8b066606ae4/ruwaxowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a9089a-a5d7-4f90-abb2-dba73bb46c82/outlander_books_5-8.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/total_conquest_mod_apk_hack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0aca4c-2b63-4b0e-8927-62799aa18970/proform_crosswalk_397_specs.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144576765/bopawulepatuzuwep.pdfIn PDF document text
    • http://vixifalino.pbworks.com/w/file/fetch/144574014/94907906644.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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 5500 bytes
SHA-256: 60d4332defb36b4d1b9ed591285eca47f88ec96ab017fb530910f1d29c8db460
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 10708 bytes
SHA-256: 242b8828fd999c69f925c0c3f1847f359eb7ad709ce3c58d4fcc46269e65b851

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