Malicious PDF — malware analysis report

Static analysis result for SHA-256 f452c2c250acfbd3…

MALICIOUS

PDF

69.1 KB Created: 2021-06-03 09:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 31894d378a4c68216cd11b6848ba9b85 SHA-1: dcf7f40ba9821dd17b7ad298f0d44bf2d4c2e892 SHA-256: f452c2c250acfbd3e5d4f5c94f938bdc46c69eb3e6837ef3ca534aca19e3c42f
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://garglob.ru/pbw?utm_term=reported+speech+statements+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5ffd0df218368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5ff548d70e405.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/guxopowezedimon_fuxebafu.pdfIn PDF document text
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/wepizikexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_602f792e4fed7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_600b622e932ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_601d7fd1c1373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_601e2d00689a0.pdfIn PDF document text
    • https://pupaxuge.weebly.com/uploads/1/3/4/0/134096873/4772069.pdfIn PDF document text
    • https://garugufalavul.weebly.com/uploads/1/3/4/5/134507034/vogusewax_fijagoxi_xivowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_604b90eb374e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_602231ca427e0.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/5608177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466165/normal_601905fc686a0.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/dae7d223-8873-4a51-a163-ffa5fa4b5919/letter_of_credit_sample_philippines.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/66174824930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a029dd-d094-4094-b97b-0c88ef0493da/29291962154.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144499482/wilomilepebeviko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7289d3e5-fd28-46b5-aab6-6cef87d947a2/22067182270.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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 5524 bytes
SHA-256: 4e2468e73fdad69912c73361fad060a42b3c471f76bc874e0ea92c461b18a7e7
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10588 bytes
SHA-256: 3d4646f400f46b58fddea11e20d33bff88eb714d47edf6d148a4be878e0f5e92

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