Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b82322c7dc53680…

MALICIOUS

PDF

83.0 KB Created: 2021-02-23 20:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ba8c0d32c14695e2fa764330cefc735 SHA-1: 1883ff606cb10ecaae13b4c661de69a8d6619b11 SHA-256: 6b82322c7dc53680d4b921141f2041a8f8103b489a126760c6d26db8ed8686d4
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious 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://seumenha.ru/wb?keyword=norcold%20rv%20refrigerator%20not%20working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5fe9b5b500099.pdfIn PDF document text
    • http://poradoit1.site/85534233314junf9.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/Mehjrhg/32562920878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_602db1541850d.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jfgchh8/glitch_dash_crazy_games.pdfIn PDF document text
    • http://parkji5x.xyz/real_steel_world_robot_boxing_gamep38cy.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/9769252.pdfIn PDF document text
    • http://getyourscore.info/singer_sewhandy_model_20_manualc5wob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_6016c3cd49b69.pdfIn PDF document text
    • http://vorgazme.com/baldurs_gate_2_side_questsed4mq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_602e239342b15.pdfIn PDF document text
    • https://wekisakalew.weebly.com/uploads/1/3/4/6/134617168/033699bc58.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/a6f196.pdfIn PDF document text
    • https://merejeweja.weebly.com/uploads/1/3/1/3/131381112/eca91f7fd.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/jFChiWF/jiwedux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rezugekolaba/vulowifonujajozunusuta.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/148_modeling_the_carbon_cycle_worksheet_answers.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_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 4984 bytes
SHA-256: d44441e2c20ba1538da3ef7203fadda8de111f0dffc38c33b2cebbedd518f028
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10376 bytes
SHA-256: 0dbb1ec02c4e6d8b08ff17ebbf6e4210e292e640249b830b5a748150170d0170
font_02_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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