Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c30931169b1ae72…

MALICIOUS

PDF

74.2 KB Created: 2020-12-17 14:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 64546490cbd703dafc31cd33ace55d7b SHA-1: bf7898a218b95bae7d99f70fc601e9b64ff87bcc SHA-256: 8c30931169b1ae72ff08693780d4ad501d0495982e5ce70bc33b255a3a27ca45
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the presence of numerous malicious URLs suggests the document's primary purpose is to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=dsst+substance+abuse+study+guide In PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/repetuputujuwidupugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365613/normal_5fc5c05e6100f.pdfIn PDF document text
    • https://tadivibudup.weebly.com/uploads/1/3/4/8/134899420/6506814.pdfIn PDF document text
    • https://mabufome.weebly.com/uploads/1/3/4/8/134880487/sosozuravafo-begidegefe-tanojefufowudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5fb72e1c5504d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_5fb2b7d15bb5a.pdfIn PDF document text
    • https://sagekafota.weebly.com/uploads/1/3/4/3/134351395/3400729f.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/1228656.pdfIn PDF document text
    • https://sajesugepila.weebly.com/uploads/1/3/4/4/134467456/4822748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fc185432833e.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/matogapibelifiv/assume_formlessness_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/verubisinesipi.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/photosynthesis_limiting_factors_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/49780298551.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/chamsys_magicq_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/williams_sonoma_ice_cream_maker_manual.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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 5220 bytes
SHA-256: e60f20c0d3aea1f0c2be0c95ac4205ba8f85f720742facb1d4d6120b87a03a11
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 10468 bytes
SHA-256: dc3775045cce14047e2a56ec09099e6465864b0ecc2f7b62c3e92b44738dfe8f

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