Malicious PDF — malware analysis report

Static analysis result for SHA-256 12370dcb3a2af2b2…

MALICIOUS

PDF

72.4 KB Created: 2021-04-25 16:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ba496110b93cb84f5d81a9433110bfa SHA-1: cf0e6dd5e00ad0948324ac6d25cff15ec45136cb SHA-256: 12370dcb3a2af2b21184ef49f94b4f32a80485dafd2ef2a5f16cd95e3953157f
186 Risk Score

Malware Insights

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

This PDF document, disguised as a manual, contains a significant number of external links, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=samsung+c460fw+manual PDF link annotation
    • http://nilapitukiterow.22web.org/how_to_see_duplicates_in_google_sheets.pdfIn PDF document text
    • https://juguzitusiketi.weebly.com/uploads/1/3/4/3/134372303/fizatemufezulo.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/panefakirudozat.pdfIn PDF document text
    • https://tixipatu.weebly.com/uploads/1/3/1/3/131382495/3863865.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/ferosar.pdfIn PDF document text
    • https://welogodeketi.weebly.com/uploads/1/3/5/3/135326703/belufusavizabove.pdfIn PDF document text
    • http://pewodaz.22web.org/motijofejizotel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_5861cb8fc9054db6b9f40f2a7ed74b0d.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_e6496694782f4b9dbba336feedfad7b6.pdf?index=trueIn PDF document text
    • http://mikesivu.rf.gd/45999515290.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_ce885fb57b3a4746b91db63db8aa9830.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_10c7324e49b148479c44b8a754fdf3e9.pdf?index=trueIn PDF document text
    • http://keviful.epizy.com/51275673652.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_af4af8723ce54587905ef8c8467d0227.pdf?index=trueIn PDF document text
    • http://pagiwufuvefukuf.epizy.com/5143552758.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_173146d42cd84a90ba6972c8a5f805b3.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_4998f9e6e6624f2d8f4071348d694aad.pdf?index=trueIn PDF document text
    • http://belojegepi.epizy.com/tv_guide_austin_tx_no_cable.pdfIn PDF document text
    • http://pejibuturu.epizy.com/attributes_of_effective_leadership.pdfIn PDF document text
    • http://dekuravimej.epizy.com/subosoz.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 5684 bytes
SHA-256: cfea00c7fc2e7d528f3c43a976580f8e90765f0df226e9e6ae22d2d5fe2b14c1
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 10460 bytes
SHA-256: 9e42f700b80ece90631f0e646e6fea2815194a79355da3714b698235f9dd4274

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