Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccaf8b3aa44f33e…

MALICIOUS

PDF

114.1 KB Created: 2021-06-09 06:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80310d256370c0252be787283692304c SHA-1: 84fc5117429857996ece45c8dae33c2f9efac967 SHA-256: 1ccaf8b3aa44f33eb86728c695b6143f8f8468824fbc4a68ba90971073d5b8f2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming by directing users to potentially harmful websites. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://coretry.ru/pbw?utm_term=how+to+heist+in+gta+5+offline
    • https://static.s123-cdn-static.com/uploads/4489041/normal_60027b1822d5e.pdf
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/4660179.pdf
    • https://jijoforupet.weebly.com/uploads/1/3/4/8/134864875/5853683.pdf
    • https://nufulukoveta.weebly.com/uploads/1/3/4/7/134700555/zuzaxurotiveza.pdf
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/6c0b1.pdf
    • https://wosabawa.weebly.com/uploads/1/3/5/3/135390578/votepanisobunup_gowosab.pdf
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/9ba57e16c50d.pdf
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/8370102.pdf
    • https://cdn-cms.f-static.net/uploads/4459916/normal_605cd33dbfd36.pdf
    • https://govopejixaw.weebly.com/uploads/1/3/7/5/137514815/pelabeverud.pdf
    • https://cdn-cms.f-static.net/uploads/4416798/normal_603c2a3113192.pdf
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/fee94d183f6.pdf
    • https://vatenesarawe.weebly.com/uploads/1/3/0/7/130775606/buxozibijarux_finoxuwek_boxazafesoxoda.pdf
    • https://dukavudo.weebly.com/uploads/1/3/5/3/135328319/cb89971.pdf
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/vezaxeseluxoze.pdf
    • https://cdn-cms.f-static.net/uploads/4381091/normal_6063dab7d4caa.pdf
    • https://dibosowosobon.weebly.com/uploads/1/3/7/5/137511826/6199218.pdf
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/tejigetini.pdf
    • https://cdn-cms.f-static.net/uploads/4460232/normal_602875c17f7f9.pdf
    • https://ruvavaru.weebly.com/uploads/1/3/0/8/130874457/wetodugukig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00017c19.bin
c20f6ec75bd23576505f2ac2acb843121f4785b3966cc67006915f42bfb3605e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C19 5112 bytes
font_01_sfnt_off00018d9d.bin
54456dde7816b877f1428c861ecfac48508748a0c12a318adc6af99b8f728c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D9D 14052 bytes

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