Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cec8c797b9aaacc…

MALICIOUS

PDF

70.9 KB Created: 2020-12-24 06:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0d6196e87d63e6a2d249c776f890ef61 SHA-1: 7a4e10ce1099447ae3d556d44b07349c40e6f01c SHA-256: 8cec8c797b9aaaccf85b2f15570a45382c27a3b8288e0020ec6806d0713bef02
204 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one redirecting to known malicious infrastructure. The heuristic firings indicate it's a malicious redirector and a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. No scripts were extracted, but the presence of malicious URLs is a strong indicator of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffking.ru/strik?utm_term=unicorn+fake+video+call+game In PDF document text
    • https://cdn.sqhk.co/xejulonejo/gBhgjf4/new_york_city_recycling_guide.pdfIn PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/9161475.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/bhjv4jh/66054810931.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/KjdKpif/go_planet_enschede_vlooienmarkt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fc7dfeaf0bb8.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/lejazogiv.pdfIn PDF document text
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/laderoj_verifij.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/divuwixudibar.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/79fe46f8-4ffb-4750-a75b-a045338a36ff/84449285642.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/bikiwimupaxez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0eff2a-0d83-41cd-ae1c-d4676d966ac0/92812772935.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/jill_poole_textbook_on_contract_law.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/kipitiw.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 5280 bytes
SHA-256: 94a38d91d44012684bb984aca65b0a5c5606edb7649c33762ff0596ee89bda34
font_01_sfnt_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 10708 bytes
SHA-256: 9efeee97c4e9bebb53b424b81781d8468be356c0bf6e6a7bd1609de9518922bf

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