Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c29f00c8327a22f…

MALICIOUS

PDF

80.5 KB Created: 2021-04-15 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b9d044232f88984c21c21570ca2551a5 SHA-1: 9341cdcb3e321c30bc6594654b0ae7578863f6af SHA-256: 1c29f00c8327a22ff05f0e581a856f32e51c7bf9be46e7b5b0ea4f14c98352d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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/strik?utm_term=disney+cast+member+employee+benefits PDF link annotation
    • http://sosed.market/outbreak_words_meaning_in_urdutt96j.pdfIn PDF document text
    • http://sozefubuvigapi.iblogger.org/gurasuvezejusilaz.pdfIn PDF document text
    • http://fesabip.iblogger.org/what_does_a_positive_school_climate_look_like.pdfIn PDF document text
    • http://sandwichhq.club/37869149650wdrph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_601d4f2f289cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_60565479da1aa.pdfIn PDF document text
    • http://simkosa.website/suzuki_gs_125_manuali9aeu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekalalorupip.rf.gd/4311826697.pdfIn PDF document text
    • http://pewejexuti.rf.gd/51086368293.pdfIn PDF document text
    • http://xebinuv.rf.gd/free_consulting_services_contract_template.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_85bd7d6bb7f34aeab4b87d7b9ff4a1f8.pdf?index=trueIn PDF document text
    • http://gunerepulesin.rf.gd/similarities_between_evolutionary_and_revolutionary_socialism.pdfIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_a727ccf7390944188018ce0f6b562259.pdf?index=trueIn PDF document text
    • http://refepow.epizy.com/92522300766.pdfIn PDF document text
    • http://pexabeni.rf.gd/are_old_car_seats_safe.pdfIn PDF document text
    • http://venugowus.epizy.com/29791431075.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/pulpit_bible_commentary_free.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_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 5404 bytes
SHA-256: c2266529237a7402b1591743cfbe7b06ecd07d0b8143c53b1247a7decf351d66
font_01_sfnt_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 11224 bytes
SHA-256: ae357236858dfa5d89c8142650bc6c774a1013e30595f86416dae3c43f188bab

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