Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b60361699ce3e6…

MALICIOUS

PDF

82.3 KB Created: 2021-03-28 08:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f4a35a033a2fe9d06f7c027e8034a63 SHA-1: 17eb00abb184ead91a00b57e59d6c2869388ac10 SHA-256: 78b60361699ce3e6f6b2fd1d9d6cec9db7c2d57f691e8db7252a3e4dde74617d
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 0.9997

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://nipisod.ru/strik?utm_term=mercruiser+4.3+starter+motor+problems PDF link annotation
    • https://jefamiwufilidiv.weebly.com/uploads/1/3/1/4/131409158/631c0.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/04c28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fe38c0bd1f34.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/38983918333.pdfIn PDF document text
    • http://trujillostacoshop.com/parker_toms_quantum_field_theory_in_curved_spacetimew4ty6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fc995ae43487.pdfIn PDF document text
    • http://sibuvre.com/capitalization_exercises_with_answert7tv4.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/endometriosis_tratamiento.pdfIn PDF document text
    • http://volosaty100.xyz/samsung_smart_tv_55_inch_crystal_uhd963a6.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/4815570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://854397d5-242e-4836-9f1e-4d22a5541959.filesusr.com/ugd/88a329_83c246605e734784a6f90f2470f2508b.pdf?index=trueIn PDF document text
    • http://vokesakogo.onlinewebshop.net/mewexix.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_164ee74d8e5a42629bdf8b8e7b03c063.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/cicerone_beer_server_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/abobora_cabotia_assada_informacao_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/sun_joe_pressure_washer_wont_use_soap.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/98612421369.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_9e0621ceb7414e578728ac8e60f09519.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_8fca57e8785c4629a5179779cdc0f42d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/murudute/batching_plant.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_225b767348df4659a41256df19b21fe2.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_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 5508 bytes
SHA-256: 94c069b924d0ebdf22e146f6754fd091633842bb9ce7b031388bdb51b1df239c
font_01_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 11032 bytes
SHA-256: 5b661dddb7871dd76f11597acc454c1609b6ddfee385cc798f87832cea95fabd

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