Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb140a0688f4d60…

MALICIOUS

PDF

79.2 KB Created: 2021-03-09 09:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5f425b55e9a14602628ff15511e91b9c SHA-1: b516cfa016d71841e277de0abfef2582d7ec5977 SHA-256: 1fb140a0688f4d60055e91418264edcb677d5d48428b93cd0e1499106b41dde0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards the document acting as a lure to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=ethiopian+dictionary+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418556/normal_5ff5d3aedb432.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/R0gdhbZ/juwuvuralamupufanimozagi.pdfIn PDF document text
    • http://fumigatoff.online/how_many_generations_of_amazon_fire_tablets_are_there4dmfn.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzesowasu/jhigjgf/risk_assessment_example_project_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_60167fe5874d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423145/normal_5fec3be4bfa55.pdfIn PDF document text
    • http://kyukty68.xyz/84848971435rw4d7.pdfIn PDF document text
    • http://promooffer.site/arabic_grammar_free_downloadn8axf.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/YS47iCi/11284107159.pdfIn PDF document text
    • http://easterthjg.com/62357853069xx93v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_5fd34f53d8b98.pdfIn PDF document text
    • http://fesilax.22web.org/worksafe_victoria_hazard_identification_checklist_template.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/jhbShdH/adidas_winter_hiker_speed_cp_pl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_8616a8ae4e6647aca2c364b6f5947097.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_9ec49cecb3eb44d3b98ceb6901e28e36.pdf?index=trueIn PDF document text
    • http://malalepotim.rf.gd/pitigipasetuzop.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_e1a4607a22d546a8937ad49664d7a741.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_b5f97a6d492a4de09a7c85291822b22a.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_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 5092 bytes
SHA-256: 21ef156485cf8f48e64bfab2232b2f257f8eec0cd2e8f5c4f91b3653e6165cb6
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 10240 bytes
SHA-256: 48ee7bdb6a8eeaac1b87d3d511a1a1a6453d72799b768f17fc82469d03ab6b44

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