Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd36e2362698df5…

MALICIOUS

PDF

93.4 KB Created: 2020-12-26 20:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5c94893e7f85fb9aff50da9487b718e SHA-1: d612c0243b16f220995828871b9c420e7b120bd8 SHA-256: 9fd36e2362698df5d5f8f9bce5ffc58f2daa5ab3cf3981559504b052a0001e07
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The heuristic firings indicate this is a malicious redirector and a link farm, likely designed to direct users to phishing or malware distribution sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://ggtraff.ru/strik?utm_term=kobe+bryant+lebron+lakers
    • https://cdn.sqhk.co/favejofu/3Ghglhf/40696536987.pdf
    • https://vojitimene.weebly.com/uploads/1/3/4/5/134596684/9652809.pdf
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/vekisifo_suzunupebu_pavogosakemo_ledafedodom.pdf
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/7ac0c.pdf
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/desepawizizo.pdf
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fb5490f7e4af.pdf
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5fc8159dcefd7.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_5fad118528fdb.pdf
    • https://nubazodakop.weebly.com/uploads/1/3/4/8/134850303/8877f9.pdf
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/waxokomijipusujajul.pdf
    • https://cdn.sqhk.co/rejibebadit/zgc5Dgj/75282640418.pdf
    • https://lunogowome.weebly.com/uploads/1/3/4/8/134859941/nekaguxixezasub_nezavetoxef_valumebiw.pdf
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/viwusal.pdf
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/wifuxaxiwefasajedan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/124cc605-db39-4257-a018-c750d9954868/gokedur.pdf
    • https://uploads.strikinglycdn.com/files/147d163d-276a-4950-9161-2dad1b59d124/67003509451.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ee6.bin
80690474ecb551b6663529cf40f20bb10be07a4e18c8072ade5b3cac7ffa0e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 4952 bytes
font_01_sfnt_off00013fd2.bin
be9e9e1d81905add3fc322e36128132c71d63a4c9f5e29cc28e3fa2985b9d80c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD2 11796 bytes

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