Malicious PDF — malware analysis report

Static analysis result for SHA-256 a391f99a31ad8b03…

MALICIOUS

PDF

92.1 KB Created: 2021-04-28 00:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1a758673339d69f8a7f8fbce9822668 SHA-1: 360e9291aad0f4ddb793c096ee5242318767cb88 SHA-256: a391f99a31ad8b0396c062c8a6d93343108fbfdcc91bd9b5231568921a655afc
186 Risk Score

Malware Insights

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

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 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://ponafet.ru/strik?utm_term=top+ten+biggest+stock+markets+in+the+world PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485572/normal_606a7173784df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_6036b51d5ac6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_602501cbb20d0.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/2fcf0dc0f.pdfIn PDF document text
    • https://telabafulux.weebly.com/uploads/1/3/0/9/130969700/zebekinodapu.pdfIn PDF document text
    • https://sefuxogam.weebly.com/uploads/1/3/4/4/134466031/5332867.pdfIn PDF document text
    • https://nonuradijo.weebly.com/uploads/1/3/1/4/131406562/wopatupegoxikebok.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/kofevuwadevoni.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/mekikadimabadux.pdfIn PDF document text
    • https://wazaziti.weebly.com/uploads/1/3/4/0/134018063/nopivirojipurim_kenobadobiluke_norozuwabemob_kukibito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_5fe9ff374667b.pdfIn PDF document text
    • https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/373988dc1b314d4.pdfIn PDF document text
    • https://pigakuri.weebly.com/uploads/1/3/4/6/134684466/3add8e35d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lazesej/gefixasopuvam.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_704cdb1e57084076a24dd88f5ba22dce.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_67ba5a01ca804808adb9113f555150e3.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_030d49b7a27245ab8fa33b56920e0408.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/how_to_take_apart_and_clean_honeywell_tower_fan.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/air_quality_measurement.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/academia_brasil_performance_alfenas.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6fe0fb97412745faab014fac9ab0b887.pdf?index=trueIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_130efb9660a449ec83890374e8ddf22b.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_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 5732 bytes
SHA-256: e8f14907961b25481591a1408c1d8cd9d6a1dad55bdbf5988f02ec4647ea2d6b
font_01_sfnt_off00013b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 11760 bytes
SHA-256: 5419f78886a374d7dfb98a25a13c4ff71978a06d4631e6c358a0d262940bcd24