Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64fb61c38175625…

MALICIOUS

PDF

92.6 KB Created: 2021-03-04 08:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 78df72ff583d40fa62f13dba8760a99e SHA-1: 137988ad0588393b6bb38759de509d01eba9b09e SHA-256: d64fb61c3817562506be3c360d1cd76ffb000c4f1d786c58a042e7986269ea95
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=area+of+regular+polygon+worksheet+with+work PDF link annotation
    • https://mupamibamaximas.weebly.com/uploads/1/3/1/3/131379846/bipulamaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5fdc477bcc072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_6030a5d367ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5fd14cedcc7ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ffe0b579046f.pdfIn PDF document text
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/jirokirenajuko.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/56485653880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_602a7d066678a.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/d6b24ba.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/3591991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466370/normal_60071c2d1fc9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/66972243315.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/daxilata.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/55250738180.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/75411137854.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/banana_republic_men_s_pants_fit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/movon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 5408 bytes
SHA-256: e6c4bf318368628dde8d7b5bcbd1c7d557959230da6cadbdd7aa1ff17fc50cb4
font_02_sfnt_off00014023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14023 10060 bytes
SHA-256: badc12c90d9cae900f798a0f1ff0c563050dd4f3f642f777a773d46a430bbfd8

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