Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc75fb81127c2619…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 22:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 21dfe85f862099a3d0c74fd3bdf305da SHA-1: 659a55ca6057e6a7b678ca124af56647b99afaba SHA-256: bc75fb81127c261923744b83b3a043f2f64a16fdda338583a28dcbafcd9b9c26
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL leading to 'baarspo.ru', disguised with a search query for luxury cars. The document body, though heavily obfuscated, suggests a similar lure. The presence of multiple disposable domains and link farms further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+is+the+most+luxurious+lexus PDF link annotation
    • https://cdn.sqhk.co/dutudovajud/ijQewgi/17586544987.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/eXjhlcK/bass_pro_shop_near_bolingbrook_il.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/OSwm7ia/58904230405.pdfIn PDF document text
    • http://imm-shoes2.club/how_long_was_the_great_depression_in_americaa3x52.pdfIn PDF document text
    • http://pixubak.iblogger.org/54974032264.pdfIn PDF document text
    • http://raisinshub.club/metformin_xr_less_side_effects5s1vp.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/geyTijv/vegas._com_coupon_code.pdfIn PDF document text
    • http://lovepositions.info/levorogexsrslm.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/gidTjcW/85139061867.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/ij46Pgf/7302602931.pdfIn PDF document text
    • http://8gusevshop.website/ragudazizuwuvo4mso0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevusup.atwebpages.com/how_hard_is_gre_quantitative_questions.pdfIn PDF document text
    • http://zujopafupo.epizy.com/xeralosurixarexenikitesi.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/fundamentals_of_physics_11th_edition.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/how_to_install_xfinity_cable_box_to_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/ballymaloe_relish_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/selolipalapuxumujojogew.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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 5004 bytes
SHA-256: 30243469e3e6f97ff9e9c1eb2289ee72177f55f23b19c1f665121fc500f96470
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 10816 bytes
SHA-256: 96fc88c0a6a7206fb15a8f87539b04eb7507da4b201e5a240ac7ce37372a558e

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