Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba97131e49bd7265…

MALICIOUS

PDF

77.4 KB Created: 2021-06-01 07:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4de220afc0782307169ea58f4d9d625 SHA-1: fb54e2b624b28607aa980aaad81249c1fa897723 SHA-256: ba97131e49bd72659a670bd774fa20cbbc547910a691734ef46a9f5a44de78c9
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/pbw?utm_term=arduino+afficheur+7+segments+4+digits+i2c PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490739/normal_6012d97dd308c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_603539b7184aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fc82a9eb9a5e.pdfIn PDF document text
    • https://zibozofebar.weebly.com/uploads/1/3/0/7/130740265/3785352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_602c5172b2220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_6018c151091ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5ff71a3b30799.pdfIn PDF document text
    • https://rumejujosuzix.weebly.com/uploads/1/3/1/1/131164455/491ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fcdce151e79e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_600ec2912049a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_6031725eaabd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe673849ed99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_60170b8aefd2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446401/normal_5ffeb426431ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_60478d9315b8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144418386/goxugibejosil.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144439812/how_to_reset_maytag_bravos_mct_washer.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/descargar_pokemon_mundo_misterioso_exploradores_del_cielo_espaol_mega.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144413748/what_is_importance_of_family_planning.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425316/diferencias_y_semejanzas_entre_los_gneros_literarios.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/livro_anatomia_e_fisiologia_humana_download.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/short_book_review_of_treasure_island.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/35150296826.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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 5692 bytes
SHA-256: ac588e8958de6aa1cd93106000143143fa8c8c6d91810a598b9ee362f86d8810
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 11440 bytes
SHA-256: e1eeee9e66ce4a32165c319ecd78b8923c3386b5f6c9bd76d3420f1ec94293f0