Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5564c03a2f8b7e3…

MALICIOUS

PDF

72.6 KB Created: 2021-03-23 12:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1104741d6f6e16c063eb81a5c1a52581 SHA-1: 545098ba711587b5f483859bcf988c27c2c4bad0 SHA-256: a5564c03a2f8b7e3c0d82d5317fa342fa3e2d8e6283c4766847e20b481d5783d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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://ponafet.ru/award?keyword=cbse+class+10+biology+chapter+1+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/jukunobegabe/hbajagf/nizokidur.pdfIn PDF document text
    • https://fifofisepag.weebly.com/uploads/1/3/5/9/135985139/sezedikuxutaz-vulisinatewixum-sunabe-biziru.pdfIn PDF document text
    • http://tuvuleworejuxi.22web.org/how_to_charge_beats_studio_headphones.pdfIn PDF document text
    • http://kagivumuro.iblogger.org/how_many_calories_should_i_eat_17_years_old.pdfIn PDF document text
    • http://floradoma.net/bc_c_caste_full_form7vjp6.pdfIn PDF document text
    • http://wiwafapudipib.iblogger.org/pdf_bridge_to_terabithia.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/hep1ljb/nikko_air_elite_115_calibration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_601dd0464a9f3.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/fender_fm212r_schematicjx71m.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/bizerexeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_603365e51f411.pdfIn PDF document text
    • http://55571.ru/how_many_cards_does_a_deck_have_without_jokersfy4hk.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/wudiwaki.pdfIn PDF document text
    • http://successinyourlif.website/domain_name_generator_businessrfkbq.pdfIn PDF document text
    • http://1xbet-football.fun/177158819321tpq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_a3db80867a3841b09af872b0cc297cd7.pdf?index=trueIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_9d430db5329247219e218b948782b604.pdf?index=trueIn 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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 5756 bytes
SHA-256: 63a08e58fcdda86a4d9585488d1b2c69e4bff29b50111f427ed8a213efee0001
font_01_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 10788 bytes
SHA-256: 99199aa5dabbbd9bd4a980a48701cf16d7045b562a9b8ea4bd331059a9c720a3

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