Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d160f3731471157…

MALICIOUS

PDF

73.9 KB Created: 2021-03-09 09:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 755129189cddee16e3ad44c49b0777d9 SHA-1: 1da730e00f7f453a791716bd40bd9d773115d7c7 SHA-256: 4d160f3731471157c6f292b42b360e889770caf18c1c4d7cdc5909fe2a334b17
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a course workbook.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=android+developer+fundamentals+course+practical+workbook+pdf PDF link annotation
    • http://tebeririz.scienceontheweb.net/niwomofemakew.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/cgiRcgc/ragesiwatowone.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/fajalivakb2iey.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/arabic_hebrew_lexicon2lklj.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/que_tipos_de_sistemas_del_cuerpo_humano_hay.pdfIn PDF document text
    • http://gaydating.world/kidney_coloring_structure_of_the_nephron_answersc7oql.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/sjbgeBL/sotefezenud.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/papavemuk_takezepiguda.pdfIn PDF document text
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/6248806.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/pijabugazexasadigek.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/audio_technica_at-lp120_usb_turntable_-_black.pdfIn PDF document text
    • https://pezomivagijo.weebly.com/uploads/1/3/5/3/135392772/jatod.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/puveliv.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/muzazudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duwemanuwixam.atwebpages.com/races_warcraft_2.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/hoover_deluxe_elite_rewind_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/raspbian_jessie_image.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/82549530569.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/free_carfax_autocheck_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/68338865764.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/malice_mizer_beast_of_blood.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/longman_dictionary_free_apk.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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 5644 bytes
SHA-256: 6f28d21ecbf2e455e60dbe9ae5e5e5e090fa2618a127ade5a32dcb92cdd762c0
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10240 bytes
SHA-256: 7adfef550660a593ad20a0366489a588b2f9466eecd6208d5fdabad9e5c5fac4

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