Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a5dda4b6b86efc…

MALICIOUS

PDF

78.7 KB Created: 2020-12-28 12:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: babd61f400c95e18ead52442a2b2c886 SHA-1: d2110412f8342d904ebbd9d55e9f730f05ad1c6d SHA-256: 88a5dda4b6b86efcd194fd8339ec905e423d90afb02a0dfbcec42e6a7b215f7a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure and heuristic firings point to a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=chicago+cubs+score+today+espn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fcc8d0e13a09.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/gizosarog.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/djWihib/free_online_music_making_software_for_mac.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/9007198.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/metoxazod_lepadedoxij_valarum_logiziva.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/tibijivedopofonum.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/pesemufofikusom_kumixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fafd36c25e19.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/703f3910-6753-4e02-8ab6-c2533c85587f/kirovilagogejikululonako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad66ed0a-d7f7-4c69-80bc-8a6c01c8482e/28539159624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e884be5b-75cd-4261-bf10-dc4a462f621e/wood_pc_case_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad06b09e-67b1-4c40-89df-afddae60fe01/tokyo_drift_mp3_song_download_mr_jatt.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 2888 bytes
SHA-256: 26ba5c8d1583574648fd6e595d23dee3122ef52e1b97b4330dab96c4d4c4123d
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 5448 bytes
SHA-256: 140f9cc43efa23c264e3081d9b8e90555f0ebd9ac363af820b19a92c883598ee
font_02_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 10600 bytes
SHA-256: 7bb24ada2fba37227f8acd8642882c036d212a7f010011c0ac754859b14b17dc

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