Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbf183c10302c2e…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 22:33:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aebebfa08cf02af7a38f9aa773909c0e SHA-1: f87680eede92eb0b086e29f0d08f44a19d2d7457 SHA-256: 8dbf183c10302c2ecaac5d2857dd1b2bfbedc03486380d6b55cce10a70225bf2
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'leonvi.ru' and disguised with UTM parameters related to HP printers. The presence of many links, some on disposable hosting, suggests a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=hp+inkjet+printer+4500+series PDF link annotation
    • http://funseeds.site/70403822451zxnck.pdfIn PDF document text
    • http://urolog.xyz/264031071559gtad.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/pawur.pdfIn PDF document text
    • http://podarokinsta365.site/58473677666ixc1h.pdfIn PDF document text
    • http://fitness-ital.fun/finger_labyrinthgzwl0.pdfIn PDF document text
    • http://instapriz365.online/kiguteg3lgqn.pdfIn PDF document text
    • http://cashtanks.fun/19937266779566oy.pdfIn PDF document text
    • http://nanolenka.xyz/lochinvar_commercial_boiler_reviews21iwd.pdfIn PDF document text
    • http://fruit-ital.space/easy_way_to_remember_maths_formulasugsvv.pdfIn PDF document text
    • http://galoomer.online/jebudutedczpkl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukidagijonola.rf.gd/wild_animal_worksheets_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/christmas_music_playlist.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/affidavit_of_support_form_i-_864ez.pdfIn PDF document text
    • http://duzewinabo.epizy.com/fadufizimo.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/guxifisakonegesemagel.pdfIn PDF document text
    • http://zipoxibel.epizy.com/66789738902.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/79740451243.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/portfolio_one_page_template.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/gazetted_officer_format_for_aadhar_card.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_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 5028 bytes
SHA-256: b383ce993474279d2ef16ac2f90ad257af4b68ae3cb41e96f9050dc1bbbde1b7
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10712 bytes
SHA-256: e5c1286907edd5e1b15718a54a491a280ae9763339e3ab9e98f063d8977e79ce

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