Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47cdfe4fc707932…

MALICIOUS

PDF

74.0 KB Created: 2020-12-07 03:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 759a051276ce9b3a481f8e1fe26d6910 SHA-1: ef5144991333938ee5368cc613f488fe320222d7 SHA-256: d47cdfe4fc7079322b6c2fd6d1af0be2ccb2ef7c4de44666c30ce2db85b7f3dd
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain technical terms related to engineering diagrams, likely a lure to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafftec.ru/strik?utm_term=draw+the+shear-force+and+bending-moment+diagrams+for+a+cantilever+beam+ab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479460/normal_5fba4c6ca2cc6.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/4779879.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/7a877881fe.pdfIn PDF document text
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/kusosife.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/dajipevexobe_zubokuler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_5fafab7bc4d65.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/4aeb12fda.pdfIn PDF document text
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/2061091.pdfIn PDF document text
    • https://gigewobejej.weebly.com/uploads/1/3/4/6/134638222/5aa29cba.pdfIn PDF document text
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/kasipusad_mawotenefasuv_sawebedikaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_5f942463cc6eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5faaccaf5032b.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/272941104816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_5fabb79047944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/nigoxoloxiwedom.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/47220266586.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 5548 bytes
SHA-256: c05eefc5b45e88084ceb0996f12ef580c57541fb6a40a36a757b3051f6d3c103
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 10296 bytes
SHA-256: c331aa61c04e2f402d8391d70c436e7baf9f9ce8ea87a9c38e989e1b2e3f09a7
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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