Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb14646d7b581f7…

MALICIOUS

PDF

71.3 KB Created: 2021-04-10 11:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 49a6737e9b60b74700cfa81095f37f24 SHA-1: 7b57ca2392dc4ceb1847301e5ceb0c0a26fc9ace SHA-256: bfb14646d7b581f70adea752abc3e81237fc2cdc4593bae43f70279845466419
186 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'Honda 4514 for sale' but is primarily a link farm with 30 external links, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/strik?utm_term=honda+4514+for+sale PDF link annotation
    • https://josifajine.weebly.com/uploads/1/3/4/7/134761936/kovujimapu_kolasewerizutil.pdfIn PDF document text
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/e6f1c.pdfIn PDF document text
    • http://indohealth365.online/95453874227vg2b3.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/ejehiTU/bean_coloring_ultimate_aliens_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/dgdgivM/46105043564.pdfIn PDF document text
    • http://pelistens.xyz/236719341095pa3y.pdfIn PDF document text
    • https://cdn.sqhk.co/vigefifobot/jdwgi2y/light_up_reindeer_antlers_for_dogs.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/gejofi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/hjiibTi/fosuvofekexexa.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/mizopuful.pdfIn PDF document text
    • http://twirlini.com/what_4four_factors_affect_flavor_perceptionyhr6l.pdfIn PDF document text
    • https://mopelajizefuxo.weebly.com/uploads/1/3/0/7/130739073/xerapawowekevut.pdfIn PDF document text
    • https://woxuxafo.weebly.com/uploads/1/3/4/6/134652349/xisiroj_dukogewuxepu.pdfIn PDF document text
    • http://kfcrabota.ru/38474712443260mk.pdfIn PDF document text
    • https://bejizasidofivi.weebly.com/uploads/1/3/4/2/134234705/wikagegotik-pimowofonevivi.pdfIn PDF document text
    • http://montana-media.com/nesororamuxedagirug0o.pdfIn PDF document text
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/115c9909b774c.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/gosete/svq_level_3_business_administration_answers.pdfIn PDF document text
    • http://vujujejinegu.rf.gd/94708667957.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/types_of_admixtures_used_in_concrete.pdfIn PDF document text
    • http://jabasutazupalun.rf.gd/wikesazuwegosugetilav.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/2403551158.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/dibetuvatokuzat.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/potokuvir.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_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 5124 bytes
SHA-256: 0c4ed665d2c0eef2211a9bbffd226adee6bf815e272671942a79055dd1560585
font_01_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10800 bytes
SHA-256: c3704e2758dd85cc443a50c3402a0b77c599988bb899d5b336ea691a829803e2