Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f3c8f63238debd…

MALICIOUS

PDF

73.7 KB Created: 2020-11-25 03:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a91a23162af5773585339c06db62ca57 SHA-1: e33ee8902e079e68fe1ca4bd32dccdfe3292ca41 SHA-256: a5f3c8f63238debd2d554593816546e69efbb060a3e943b0f66bffaa3ddb90ae
214 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 multiple heuristics and an ML classifier, specifically flagging it as a redirector and a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The primary function appears to be directing users to external, potentially harmful sites, consistent with phishing or malware distribution tactics.

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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=skid+plate+carid In PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/kowupobab_xevawikudapir_kuxamuviwasuzad_jixavusatidek.pdfIn PDF document text
    • https://bovipapofubamo.weebly.com/uploads/1/3/4/3/134364795/mizoviko.pdfIn PDF document text
    • https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/robepofisekedo.pdfIn PDF document text
    • https://xakabitugaret.weebly.com/uploads/1/3/4/3/134366923/nidudulobudogoximu.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/kepigijepo_tajudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f94e5ec65ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5f9ae579be77f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_5fa5a7d89a297.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://uploads.strikinglycdn.com/files/14df14e1-31f1-4323-bcfa-72c1e78e2460/sogowekasapapela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4e80d3-ac98-46f6-bad1-dbe0d989fdf2/fotebejesajibinaremux.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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 4628 bytes
SHA-256: 39e6a4d48b594b6e3ce0142606482a053b1c05c72251f68e457b6e49d9e3c003
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 11352 bytes
SHA-256: 42067fef82eea59b682cf54d5b9674f671f24ad69b116012a5dc1f1b386e0c47
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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