Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbbc8938ed6b3a2…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 00:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b71203c8e48ee34e815bad1682e7e927 SHA-1: 2fe631b7a84a8d3dded7788092303ea9bfa62be6 SHA-256: 9dbbc8938ed6b3a2148159ee94aa1470ba352024063e9d89409f205c82536e10
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary suspicious URL pointing to 'nipisod.ru'. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a business-related lure. The presence of embedded URLs and the link farm nature strongly suggest this PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://nipisod.ru/strik?utm_term=what+to+look+for+when+buying+an+existing+business PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369493/normal_60551fe1d98cf.pdfIn PDF document text
    • http://businessoutsourcing.org/problem_of_pain_chapter_61vsyv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_6064f0a124d88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fcecf0b61f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_601723a4857fb.pdfIn PDF document text
    • http://amaryllis.space/chanda_cassette_hd_videog3ae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fed9ea18db7a.pdfIn PDF document text
    • http://disconto50.info/sebexarozeraxoriruvuviguth76ep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_6025b7029a323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_60617ea90abe5.pdfIn PDF document text
    • http://kismyketio.com/565869781441k5qn.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/information_security_interview_questions_and_answers_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_6037460c14f56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/senodiw/69667435741.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/problemas_ambientales_en_mxico_2019.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/jekibexetiwapirotonun.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/68655384845.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/wukojololij.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/antony_and_cleopatra_folger.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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5508 bytes
SHA-256: 1e95755e2a325c7cec50fe89b0a3e0c6cd951bf2901c8caf1d254a7d9cbec17e
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 10764 bytes
SHA-256: 8c8e34dc030d8a596f1ddace252da54eb3d337fc59adde251b1ae7172d1998fc

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