Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a22d331a9c498…

MALICIOUS

PDF

70.8 KB Created: 2021-06-08 20:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 21e466065c9bebeb12486744797d8bae SHA-1: bb4dbe42397d3db3ca40797794ec509882d79c5f SHA-256: 7a9a22d331a9c498d318f4d2ce35879e83a35dde114f88ad99b27ca9bfddd5d5
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://lozipotod.ru/123?utm_term=tissue+box+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418166/normal_603f7f827b2bb.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/7927631.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/a8f0d4d6bfd1ec9.pdfIn PDF document text
    • https://rifojiditesi.weebly.com/uploads/1/3/1/3/131379396/91a17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5fec3cf43e3fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_602cac182a227.pdfIn PDF document text
    • https://zinikatutonew.weebly.com/uploads/1/3/4/5/134504697/jowimapuj-jujapujonetab-filopap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fde326b990a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxexuwej.pbworks.com/f/what_to_write_in_a_one_year_anniversary_card_for_my_girlfriend.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/photosynthesis_cellular_respiration_and_fermentation_worksheet_answers.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144514644/64209596550.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144413181/38320761054.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/22628869355.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/zapiwo.pdfIn PDF document text
    • http://xovelezid.pbworks.com/f/90975484597.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144460107/how_to_change_a_thermal_fuse_on_a_whirlpool_duet_dryer.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/33559207632.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144460026/12439003460.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144520419/47660990084.pdfIn PDF document text
    • http://dukujaxosap.pbworks.com/f/microsoft_excel_training_schedule_template.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 5248 bytes
SHA-256: e327d4d635c63dfed397caeacf32bae94f4b5819983a72231199edd7f182cd43
font_01_sfnt_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 10404 bytes
SHA-256: 7a481a38aa78b3d0713af64843a4257020ebda4521fbafcb314cc71bde61cbad

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