Malicious PDF — malware analysis report

Static analysis result for SHA-256 daba136b9a106115…

MALICIOUS

PDF

107.8 KB Created: 2021-02-17 18:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eea375315f43da1034a94c8715a72dd9 SHA-1: 248bc8004d5ed9b4b637b2bc9718b4c6e1ca5620 SHA-256: daba136b9a1061154c5847b890b97bd80a31e6bb1776328c67e69fbbcc09fee3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO link farm, with many links hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://druttle.ru/strik?utm_term=qual+%25C3%25A9+o+campo+de+atua%25C3%25A7%25C3%25A3o+da+psicologia+organizacional PDF link annotation
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/birikegaw.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/d94hjid/police_officers_shot_this_week.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/Diajdgi/32806989135.pdfIn PDF document text
    • http://getveran.site/31734474858nmljr.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/bikuperejekog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fd7d64b23bdd.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/68544134694vuj53.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/JZrjj3W/wonusilutekabu.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/abhchbN/49502830156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5fdcc06f41a66.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/2ijsrwM/83878166617.pdfIn PDF document text
    • http://propovar.ru/nokoduxugalok1m41b.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/zhgHzyi/76452201126.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/3oaijgg/dell_keyboard_kb216_driver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_601bc29a648b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60188a05d9412.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/remavuj/brain_teaser_worksheets_year_5.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/following_directions_worksheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/manualidades_navideas_con_cd_y_vasos.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_off00016332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16332 6144 bytes
SHA-256: f606d69d5d9c2c251d40f60bd320df49748c6883b19c2fadd9f7abb65f1e61ad
font_01_sfnt_off000176ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EE 13056 bytes
SHA-256: 210d9723e7c14a568447feec739b2a5ff6052b1e35b7286d5db6602de7136132

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