Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b043c086ec9d1e7…

MALICIOUS

PDF

78.6 KB Created: 2021-02-19 10:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fdfb4d7679e6797614313c266b799f5e SHA-1: 9a0a823e9331926f3670326070cbe1c25ee01690 SHA-256: 2b043c086ec9d1e768075b591a396ac691767d02bb41efbbe3d0e2fb5785537f
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=dracula+bram+stoker+castle PDF link annotation
    • http://guitar.su/build_my_life_piano_sheet_music3kevj.pdfIn PDF document text
    • http://logmeinnow.xyz/business_analysis_body_of_knowledge_v39klak.pdfIn PDF document text
    • https://fuluposusiziz.weebly.com/uploads/1/3/5/3/135321682/bewovolu-nekofimat-tofolazogi.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/7369248.pdfIn PDF document text
    • http://vafakewa.iblogger.org/angular_8_viewchild_form.pdfIn PDF document text
    • http://kismykeitio.best/bateria_virtual_pro_apkwsepc.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/koxokizowokuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_6025394c75b0e.pdfIn PDF document text
    • https://gojijaxokan.weebly.com/uploads/1/3/0/7/130739343/06f9a64ee6c.pdfIn PDF document text
    • http://rajedat.iblogger.org/fabenosib.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/jiwokokubasuxaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedaziwubisod.rf.gd/19369309393.pdfIn PDF document text
    • http://razafif.epizy.com/aruba_305_ordering_guide.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_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 5148 bytes
SHA-256: 8d12fd490f76b1aa264d3dde157294c7530f87b03793012bc14c2ac2a8840884
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 12904 bytes
SHA-256: b3248adca3659694dbce71364a87fa20e2254e9d1c0e3850b9d3b49c8c216931

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