Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11814d4e94cce9c…

MALICIOUS

PDF

124.7 KB Created: 2020-11-24 01:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 42f3f5b478bd87532ed2f016dada35c8 SHA-1: e6a5e15f937f5f0b88562af56191d57a91466390 SHA-256: c11814d4e94cce9ca3401508e0ae20e487882136f9afa879ba5b19d6ef3aaeb8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=river+painting+images PDF link annotation
    • https://rawavofim.weebly.com/uploads/1/3/1/4/131452817/2322530.pdfIn PDF document text
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/82e1aa17171b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_5fbc30e99b445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5fbc3b878c94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fa2a93de33ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5fa9aeb3a55a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5fb6c4153f74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_5fac06f444197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5fa2af95dc8ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_5f968e7164c94.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/zofemuritepuluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5fb6e18eb918f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f872d089ecaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f8953f78e1c4.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
    • 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_off00019f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F1E 4852 bytes
SHA-256: ce46880345b482146a15c00e9e1166a6be639e3ad3759963e30c0f6041f871f9
font_01_sfnt_off0001af7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF7F 12132 bytes
SHA-256: 64d426e0d4e3ae7be2934873de02aa9ba05a0ad7e91b80ddc88db61953c0482c
font_02_sfnt_off0001d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D760 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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