Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3894c699a6d9002…

MALICIOUS

PDF

72.6 KB Created: 2021-04-02 21:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 201a75d688924c4d3e9d826f671d37f6 SHA-1: 9bac62c507dbe479e0f83552f0a2b9b809091158 SHA-256: e3894c699a6d90022072fb5dab76f900589589dedcee5f1d496776a32a7ea620
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/wix?keyword=branches+of+earth+science+worksheet+pdf PDF link annotation
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/gibumiwaxuzikur.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/b60f5f2647ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_5fd7bcb38bc97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fe383c1e8442.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/suvixiredotutas_wixavixumur.pdfIn PDF document text
    • https://perufagumitaxa.weebly.com/uploads/1/3/0/7/130738779/d992c02f.pdfIn PDF document text
    • https://notozovurex.weebly.com/uploads/1/3/2/8/132814393/ea571.pdfIn PDF document text
    • https://palobakuk.weebly.com/uploads/1/3/4/5/134523632/jomodapi_laxof_datamefeko.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/70798414406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5ffcfe32f114c.pdfIn PDF document text
    • https://vonebofakakare.weebly.com/uploads/1/3/1/8/131856314/mozijetizenadibudi.pdfIn PDF document text
    • https://zuxigazazopak.weebly.com/uploads/1/3/4/6/134688762/vuvexem-tokejum-pejironorab.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/vonorudinogoforanakefal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/rickys_monster_disposable_vape.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_dca528f72f45452f9c9bde616ccf70e9.pdf?index=trueIn PDF document text
    • https://f4f877d8-29ff-4f35-83ab-971b93db0aba.filesusr.com/ugd/f4de5e_f864e23f66684e2098f7f04c54844ca4.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_6173d4a1c6244e43a04699a203828101.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_6d31fea1b2ad4a029fdb550d69f3ee86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/daraz_bd_apk.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_a54c28ee5d7346e888003720ba85050c.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_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 5416 bytes
SHA-256: bf448c01297a67376031fe04b74b0fd893370e8c7dc603cb906890c52ed8d0a3
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 10596 bytes
SHA-256: c6d322680771ed89fbffa5b379f78040e9c84c8c3b3f3f5bf08543ff9b7ab427

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