Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fd78f8a258f33f…

MALICIOUS

PDF

71.3 KB Created: 2021-01-23 18:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d92a35000a81434f2a18cb83f8007fd8 SHA-1: f3b665114600e23c25e870f365a3dbb9a5fee9f8 SHA-256: b7fd78f8a258f33fd76cf5f2e42f333a892eb3d365b99aa8b433833144579b70
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://baarspo.ru/aws?utm_term=cartoon+boy+hd+pic PDF link annotation
    • http://tazikuruwuwozu.22web.org/physical_therapist_job_description.pdfIn PDF document text
    • https://site-1245098.mozfiles.com/files/1245098/afjet_afyonspor_forma_satn_al.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5ff23ebe7e12d.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/2075205.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/Lihifjf/tenunedipugozuriw.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/Ujcib7Y/pictoword_level_482.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/jbshdEA/dojupik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393791/normal_5ff61f37a26bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fc6d87e1af39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_60007ef858cd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_6005359eb0d70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loluxemo.epizy.com/68624171706.pdfIn PDF document text
    • http://seromol.epizy.com/tanker_safety_guide_liquefied_gas.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/calcutta_choir_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/40687810043.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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 5096 bytes
SHA-256: b2f62cfb9d74fa8592262c8e42d56cdbc77678f9e4e2f94f3e54f20dbd732a5c
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 15968 bytes
SHA-256: d500ef4af46c7b9426a898dd2b787777c241a47232e9ea6418eac5516c4a4e4a

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