Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6fa63cd3bbbcb9…

MALICIOUS

PDF

122.2 KB Created: 2021-03-21 12:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: abda5a60e2dac0f072623682c7d8071c SHA-1: 581b131d3afc1ed15a185f18ee64d66c3cd4163e SHA-256: bf6fa63cd3bbbcb948880f25a534b3a042b672142f70749f886154def505556f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/wix?keyword=2020+ice+fishing+regulations PDF link annotation
    • https://leguwilevifemat.weebly.com/uploads/1/3/4/5/134595517/31d0f4fe394d4.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/sisufetixisap.pdfIn PDF document text
    • https://tixafaxul.weebly.com/uploads/1/3/4/3/134311963/e73be2e9dfe.pdfIn PDF document text
    • https://wazafalesozem.weebly.com/uploads/1/3/4/4/134498636/fejup-vitew-ruxav-gedaba.pdfIn PDF document text
    • https://kuwomodelinero.weebly.com/uploads/1/3/0/7/130776449/4112912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fd64c4ced948.pdfIn PDF document text
    • http://twitter-center.com/power_pressure_cooker_error_code_e41abu1.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/1051596.pdfIn PDF document text
    • http://cleaner-inn.club/why_is_my_craftsman_riding_mower_not_startingnvaxj.pdfIn PDF document text
    • http://agencymedia-ig.com/how_to_cite_a_direct_quote_from_a_person_in_apa5g7nx.pdfIn PDF document text
    • http://tohld.in/sebegafigiboroberwqj0y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_6023698bace45.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/journey_to_the_center_of_the_earth_3d_filmyzilla.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/sojebelevenex/modizasajasuvuvoxeluviko.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/wunejiwodazo.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/how_to_pass_the_civil_fe_exam.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/41206405166.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/73587780468.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_off00019ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF1 5320 bytes
SHA-256: f8702e458813c392bbe96bb183e8bf99f8a9396ccd5f9d83b2e965dbc7a383ac
font_01_sfnt_off0001b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B207 11600 bytes
SHA-256: b3589a09094e6a9062773621e085d8c2ca2690a499568697f91c2f105b6d8689

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