Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a37118c450c5a37…

MALICIOUS

PDF

70.2 KB Created: 2021-05-27 06:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d96c0ca0f20c61d0ca3a8c23373dc03f SHA-1: ead68726c047668b5c194fd3ce61ab6b4539bb4e SHA-256: 5a37118c450c5a37a9237144834be48a114e11931c40d0f89c20963bed8ee556
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains like weebly.com, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though obfuscated, hints at a lure related to printable PDF word searches, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://zajinet.ru/strik?utm_term=sopa+de+letras+para+adultos+para+imprimir+pdf PDF link annotation
    • https://fixaninupokawaw.weebly.com/uploads/1/3/0/8/130873986/b3d73d.pdfIn PDF document text
    • https://tekoxinir.weebly.com/uploads/1/3/4/6/134606092/deledumajirisaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_604d7e18c5040.pdfIn PDF document text
    • https://mizefowoxeze.weebly.com/uploads/1/3/4/4/134485365/84bfc4b5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414164/normal_5fd06025e7174.pdfIn PDF document text
    • https://pikuteki.weebly.com/uploads/1/3/4/4/134459105/pajovunidoje_vezolusukabukaf.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/6eb28005daa7e.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/zopiwoke_zuguterubap_bidef.pdfIn PDF document text
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/715521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_5fe7afead459d.pdfIn PDF document text
    • https://sibuvavaxo.weebly.com/uploads/1/3/2/6/132681946/5101656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fe4461357de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_600d8731a1834.pdfIn PDF document text
    • https://turamidiwirak.weebly.com/uploads/1/3/4/3/134340523/putojizu-vixepusuve-novijugajolixu-fugafewibakivuv.pdfIn PDF document text
    • https://xajovulunama.weebly.com/uploads/1/3/4/0/134096198/pomepakufedudo.pdfIn PDF document text
    • https://gavititexufo.weebly.com/uploads/1/3/3/9/133997787/bufifap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_606bf4d7b2e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_60338a6acda2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5fda8d4dd56d3.pdfIn PDF document text
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/bususimixumiz_nukovepatanoke_gapokovejej_kodaz.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/5154a1f0-4ae3-4c39-948d-2338126fca4a/pudawasejamexefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49afe03-a646-4f35-9fe3-1921a201392a/how_to_dance_like_elvis_presley_tutorial.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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 5292 bytes
SHA-256: f9805c6b973ab56c0d7ca8ac9676eccf0a464f6fa77850b13a3804e458363909
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 11048 bytes
SHA-256: 9d183eabe02c6ef11637f18550d123419f1a724406b02595cf3ef17953e0e9b5