Malicious PDF — malware analysis report

Static analysis result for SHA-256 652806a7434c15fb…

MALICIOUS

PDF

68.3 KB Created: 2020-11-25 22:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8c44ad982dddd871998a26eb18e673d1 SHA-1: 893268513073a3a8c80c6e583abf0d4237ac9e44 SHA-256: 652806a7434c15fbf890307b7dee25a55d247b834bb5470d6eae5ea39e1c8975
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The presence of a critical heuristic firing for malicious redirector links and ClamAV detection further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

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
  • 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.
  • 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.
  • 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/aws?utm_term=adistec+brasil+informatica+ltda+cnpj In PDF document text
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/6fec2f.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/8384913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fab236039845.pdfIn PDF document text
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/serusirunejilerezax.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/1683452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f894e961ecb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fb9c19c6c73f.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/litap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f937474a6ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fa5f423ebd31.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/jinabom/cgst_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273ddc23-01f9-4cc3-b243-4bb3e19a0f97/salem_witch_trials_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6911e5c-23cf-4b18-818f-2d5a910cbac5/petubiritibiwifi.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_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 5504 bytes
SHA-256: e916b378324e032d03a3cfee809408c1b9864ad38c3c4c8a5ae79ded1c97b211
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 12296 bytes
SHA-256: 9c6d4d2df0ad03d504be4548a4327c924e981f347660c718fce0a4e1fc54a5f7

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