Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded566f26b8d8313…

MALICIOUS

PDF

103.9 KB Created: 2021-05-26 06:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c7b7d62330ef14cc3711f9f6272e279 SHA-1: 2360317c9d7d773a5aa82c7ad6ecf831c3ac9381 SHA-256: ded566f26b8d831397a2c3688767a684497453f7aa0c578b6747a47d2cc2e5ea
186 Risk Score

Malware Insights

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

This PDF file 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, likely to redirect users to malicious sites or download further payloads. The embedded URLs and the structure of the PDF point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=fundamentals+of+inorganic+chemistry+ppt PDF link annotation
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/fe0ae6c0.pdfIn PDF document text
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/9415803.pdfIn PDF document text
    • https://nojonepidafajik.weebly.com/uploads/1/3/0/7/130775859/sovabumesu.pdfIn PDF document text
    • https://tisudarolajese.weebly.com/uploads/1/3/0/8/130813738/5400172.pdfIn PDF document text
    • https://torosiwetub.weebly.com/uploads/1/3/5/3/135351177/8634197.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/polurone.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/jedabibifi.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/3783093.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/lufumafif_kukotoj_wimes.pdfIn PDF document text
    • https://kutoponipikule.weebly.com/uploads/1/3/4/8/134849894/fobazodisa_wavirabasukiw_belubogulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_603baea05de72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_60343ad599c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_6065425cef596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5ffbcf50935d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_6012cd073f055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_606e160fcc88a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501995/normal_602c33309e4f1.pdfIn PDF document text
    • https://seremojalunukeb.weebly.com/uploads/1/3/5/3/135393353/2007386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_60316901562c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488592/normal_6047857803c91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000156b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B9 5628 bytes
SHA-256: 9987234cb97297f2c69535efa513265976c982c376240b8bb98c2febbc997dfc
font_01_sfnt_off000169bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BF 12324 bytes
SHA-256: b1757ee8382e05a7181704d962b31bf3b44f4bf97933b748f2e2b9e236d344c7

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