Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c374a213af2e815…

MALICIOUS

PDF

76.1 KB Created: 2021-04-27 11:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f588d874f099fb3c797fdc4058df1d28 SHA-1: a8e9ea1812c299bc2e9fc9f694f0e5fec808986d SHA-256: 2c374a213af2e815d13371ae87d337b787caa748c2a4153b2b812670158f216e
126 Risk Score

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 0.9996

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://jacksth.ru/strik?utm_term=huffy+bike+walmart+cruiser PDF link annotation
    • http://winclean-shop.space/susukuzoloximoguvupaambay.pdfIn PDF document text
    • http://gravkamen.ru/18767176963ay577.pdfIn PDF document text
    • http://bukibiroxofin.22web.org/34804038502.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/how_to_do_multiplication_in_your_head_fast.pdfIn PDF document text
    • http://kemytbok.xyz/fesipxroxs.pdfIn PDF document text
    • http://xarijigok.22web.org/apollo_munich_health_insurance_optima_restore_brochure.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/91040676084.pdfIn PDF document text
    • http://buytoday.cc/755980445528heu3.pdfIn PDF document text
    • http://wiwomadexuza.22web.org/antologia_de_cuentos_infantiles_cortos.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/bojaxudotebabilisot.pdfIn PDF document text
    • http://feelslike35.com/98843999873qlpnr.pdfIn PDF document text
    • http://goldstein.berlin/57491534747twyvp.pdfIn PDF document text
    • http://goldalbum.ru/how_to_connect_multiple_ue_boom_speakers7tllw.pdfIn PDF document text
    • http://mirror-x.org/ronovegimurusagenokitqpgeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gokujipavelidaz.rf.gd/33658517857.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_25fe9b2fbda84d908a337da05ca63cf5.pdf?index=trueIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_4bd2a1458a69446f9e93563fdf00e739.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_5a9b7c82c95142fd9dacdf70505fcaef.pdf?index=trueIn PDF document text
    • http://dimafox.epizy.com/vivovudazenulozaporaj.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_3a54c0b34eab48a796533ed250ff7bc5.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_ef7cf10eda00451facf3ffe0be1e1130.pdf?index=trueIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_9f1e04728eaf442fb1b584191066f86e.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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 5384 bytes
SHA-256: 280cad01ef5ff6bb7f6b4ded25d483a19a99908a802323d8b6c01190f222d9fd
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10484 bytes
SHA-256: 66228652d1f71658a5b9af996fe5bab48aa1eeaf0944f0dd0298075151629061

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