Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fdc0810f5a320c…

MALICIOUS

PDF

82.5 KB Created: 2020-12-18 18:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a86bcb2fb578156c8c97e8cb5f969111 SHA-1: 101f93f0b9907fbc26e702c6cac30bda2ae14a17 SHA-256: b5fdc0810f5a320c14f833594a3c6986d28e4a8a37f3b7686edb7950bf632dea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. The embedded URLs and the heuristic firings point towards an attempt to redirect users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://trafftec.ru/strik?utm_term=oshkosh+public+library+catalog PDF link annotation
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/luzadukajolimafase.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/7235265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/golepe/a_more_perfect_union_movie_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/sidetufijiruwuduxeju.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/venkatrama_co_telugu_calendar_2018_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d690893-c7b1-4b90-b98a-f7642866d769/ley_de_inercia_ejemplos_cotidianos.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/acronis_true_image_2014_bootable_iso.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a94381fec00968438b4e/t/5fca89205d0bbc103b100bc7/1607108898757/bible_word_connect_free_word_puzzle_game.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/54228851403.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/todo_app_for_couples.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 5144 bytes
SHA-256: b914070c1029b38038cf2db5dace3a535cbf0eab27e673560fc44afb9113c675
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 5188 bytes
SHA-256: 1e27f93df8fb63e091293998f3a60c6aaac40ad276d4b4e51fb81c854d96e06a
font_02_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 11344 bytes
SHA-256: 1349133e93a662120eddca0836d77336e4b139ad50715c56a1d6b62d029644f6
font_03_sfnt_off00012edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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