Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4d48744aab5840…

MALICIOUS

PDF

79.1 KB Created: 2021-04-19 12:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d0a03b715aae6bced724eecfc499c162 SHA-1: 2015038a80dbf2f0167562538577e06de5923626 SHA-256: 0d4d48744aab58405a54ce9d3f16ea53d1ed16000035107394c8270f338b5582
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://leonvi.ru/strik?utm_term=how+does+world+war+z+crossplay+work PDF link annotation
    • https://cdn.sqhk.co/suxupijisajo/hYieggs/zifonilotubikuzo.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/sajakipevakaminaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/cbwhcUO/buwovox.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/51622421725.pdfIn PDF document text
    • https://biresunidulili.weebly.com/uploads/1/3/1/8/131856549/9a5bac906f1c.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/1jftlih/pottery_barn_stockings_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/9Yaigi0/70442842550.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/gezitifadagomifakoxixodop.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/jugodoxarojemagi.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/22562775914.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/construction_risk_assessment.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/rhddhjj/45997317167.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/f5c2e6e9107b57.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/Wgf5jct/ps_vita_reality_fighters.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/4571f76.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/jcNGjg7/xaxikakerup.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/0b992494-6fbc-4885-88f8-285c6984f4cd/2275188464.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_e31e0c367a0141c5a9702cf06371d359.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_68b5523f58814e09af76e81525ba3c3b.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_874c482d9d214c208b1b576939a3eba7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14427f6d-b2a4-4bfd-add6-6e297dc30d64/dazobinimijuxifawav.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_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5336 bytes
SHA-256: 0745ad362a589687720355bd279ee42a1a6d8157f18b8a6dcb53ca3918736cf1
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 10864 bytes
SHA-256: e2b3aa992929999c41c8aed248876e136b84aa55e6153f1d90ed112f4d7db8e4