Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa7188618c3894…

MALICIOUS

PDF

96.5 KB Created: 2021-04-23 19:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c380212a1d9ed0d3e49444bf37a3e994 SHA-1: 28fae3337c1d6e2c8c0b9140e066d1811483f291 SHA-256: d8fa7188618c38942822a7be0b26758fe21760e2a4e386dc3479136c5cf48ab2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not inherently malicious but can be used to create deceptive content.

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://druttle.ru/strik?utm_term=line+6+pod+x3+live+manual PDF link annotation
    • http://vojidovalo.iblogger.org/la_times_crossword_corner_puzzle_answers.pdfIn PDF document text
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/junuve_gimiti.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/xugisefatef.pdfIn PDF document text
    • https://rupaluvewona.weebly.com/uploads/1/3/4/7/134765546/63335.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/9169195.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/jibusufi.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/8206894.pdfIn PDF document text
    • http://nafaguxidu.iblogger.org/79797770420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonesipida.epizy.com/78624855993.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/winudazoxudemosevalet.pdfIn PDF document text
    • http://voruluju.epizy.com/madumuxinubamajejew.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/luvadezogake.pdfIn PDF document text
    • https://143c7e3e-1a56-4739-9c24-5aac26b0263b.filesusr.com/ugd/28d7c1_2d817aad85ea42fabbfa88783c35bce7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/54102127263.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_6485c55be1504c6abaa00a22acd5606c.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_ecd050a18027434fa7e17eb9d335cbd4.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_66379f3917364e81ac8cf76032562204.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_75f6e12bee1e452d8f6e01961a3d3eba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/in_the_mood_glenn_miller_saxophone_sheet_music.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d794e9f691374df48bd06fc366bf9e87.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off00013a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A06 5216 bytes
SHA-256: 8ccca7f904653c2edc43424bf7cebf1be1ba5721619d56a8f48aa6a1b18f2d47
font_02_sfnt_off00014bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBF 13364 bytes
SHA-256: 16fb3f8a1af817c40d1c86e2eaf6c6eaf62a7d95076257468c791faf98d68e37