Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37e35bcba11aed5…

MALICIOUS

PDF

75.0 KB Created: 2021-03-29 22:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c33c47987b0271c0f2eb21d36fd1da56 SHA-1: 71a62c33bbc52a2e7c50ade8480f01f27dc4f649 SHA-256: f37e35bcba11aed56a2ae498b648ab0c1a0e3c431b8cc91176306853446fb5b8
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=the+picture+of+dorian+gray+summary+chapter+1-8 PDF link annotation
    • http://rinujajija.getenjoyment.net/89158164972.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/7991617.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/julotimoxa.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/66bf4.pdfIn PDF document text
    • https://sugasukeni.weebly.com/uploads/1/3/4/8/134878852/b561e720a8.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/lavevomozugo.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/5_stages_of_grief_worksheet.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/fopibewoberalidegafobe.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/1af53d930.pdfIn PDF document text
    • http://trackengine.host/appvn_apk_english_latest_version3auac.pdfIn PDF document text
    • http://bigno.space/dukunojijutodadap8mui.pdfIn PDF document text
    • http://zarudofafibitov.mywebcommunity.org/diferencia_entre_auditoria_administrativa_y_financiera.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/sasakazasido.pdfIn PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/woxefadajujod.pdfIn PDF document text
    • https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/4093500.pdfIn PDF document text
    • https://timigotevawil.weebly.com/uploads/1/3/5/3/135329967/490f7367.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/529c973f3e5.pdfIn PDF document text
    • https://pafetujesotizi.weebly.com/uploads/1/3/5/3/135348857/fapijasajelel.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/87985474491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafuwinev.myartsonline.com/framing_agenda_setting_and_priming.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 5868 bytes
SHA-256: 9fdd6bf6d55c1baa164bf50d4f731aa07cdb5996b3cece88856b586bc4d0e8c4
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 10384 bytes
SHA-256: 723cc0342b3685d570f262bdb37253b95dd685ca386c78941aca4b2d6239bce6

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