Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e79906411cef85…

MALICIOUS

PDF

97.2 KB Created: 2021-04-02 07:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 40b2b492d0b82cffc51861d6326b6441 SHA-1: 6e928a1ad14a5284c03528ed3dde382235439972 SHA-256: 40e79906411cef856ed421f429b87c138c38da5d17d200c1b76adc5f1a9ee1c7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to a vast collection of external PDFs, potentially for distributing malware or phishing content.

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://golowaki.ru/award?keyword=bakunin+anarchist+manifesto+pdf PDF link annotation
    • https://meliwajovogowuw.weebly.com/uploads/1/3/4/4/134481672/ab76a0d140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_604e95d6adc50.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/fizekotuzudesorapaz.pdfIn PDF document text
    • http://bowenaf.22web.org/big_data_analysis_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/jihhBhg/animated_glitter_coloring_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_600cc4091d314.pdfIn PDF document text
    • http://dafusunefu.iblogger.org/administracion_de_pequeas_empresas_16_edicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_600ce7a90a113.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/hihjgiP/39837574025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fe62e310def6.pdfIn PDF document text
    • https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/88d7371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_602c66007d71d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_604464771f89e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_605940eeef599.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417046/normal_5ff7c6f22607d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6044f9d6b0b76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivifusa.rf.gd/hunchback_of_notre_dame_movie_2021.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_fc6fdd3d223f44a09dd88a065be8263e.pdf?index=trueIn PDF document text
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_ee30cc069fb845cab50b1d91edb65fe6.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_07b503ef490e4131bedc06ce384c824e.pdf?index=trueIn 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_off000140bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BD 5476 bytes
SHA-256: b5e06e675d87e0105b7a1e6ad3f00822c040a90e2b64a25b997f3b3fa14e3739
font_01_sfnt_off00015337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15337 10628 bytes
SHA-256: 9588550b94c98e849c8d14cc230f6a7975cce88a612488670d90934a9177a446

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