Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bd575e0143d0b0…

MALICIOUS

PDF

112.0 KB Created: 2021-03-16 00:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5137e1f149c90bfd7254ea3d6537b35f SHA-1: 8210e16cd4e4fe1fdb90025163dd4173759fa069 SHA-256: e8bd575e0143d0b016d48786b8ec6f7481eba89a8b0c4aea54a178971d1b882a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the PDF structure are consistent with a malicious document designed to redirect users to potentially harmful 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://zajinet.ru/strik?utm_term=chick+fil+a+starting+wage+ohio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fcdeff7ef244.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/new_yorker_crossword_answers_century_21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_604ccc6d1d405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_6007575f93c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6017ceffb543a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_60371620d1e5b.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/57860112768.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/kejudipado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_604fe2e907da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_604eb950e5430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fcc9b549c088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c004f0df-0cee-456d-9a94-23ccd0965027/geditaxofupuliba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ac6a44-739d-40b1-af11-f088566a7520/28820201160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fceb923-bb08-41a1-a7f4-9821c6e5c5ec/vefumobumubaki.pdfIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_34014f8fa46f445587c002cb9ea16de4.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_a5415d9fa4cb4dae8203962c3498da5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c1327c-e285-472a-a318-4233ad994ecb/commodore_64_emulator_pc_download.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_off000177f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F2 5204 bytes
SHA-256: c4b0bdbe4781747d14b32ad9e6a6beef0bee34d5b5d503894c424459b5a50c73
font_01_sfnt_off000189b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B2 11736 bytes
SHA-256: 18bb3bf30902987c36311d600cc2e32265ed0f61f36605c600720e6c69e5e1bd

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