Malicious PDF — malware analysis report

Static analysis result for SHA-256 5683578ddaedad1e…

MALICIOUS

PDF

68.9 KB Created: 2021-02-19 22:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 007aeb867309f22fa660159116b295fb SHA-1: bed865c1be57f83139f8709e95f3e06898ee3f79 SHA-256: 5683578ddaedad1ec1764e239cb2f16328c1f6515dc0e193c306285f46922b82
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for further malicious content. The presence of a link to 'bologen.ru' with a keyword related to a user manual indicates a lure to disguise the malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

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 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://bologen.ru/wb?keyword=mr%20coffee%2012%20cup%20user%20manual PDF link annotation
    • https://cdn.sqhk.co/bajipugotox/bhbEgft/levosumavomexi.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/qjcgdig/56818282165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fcdc50658306.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/xhai1ji/league_of_berserk_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/ECifhjC/ghost_rider_fortnite_boss.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/h9jjxjb/budisipilo.pdfIn PDF document text
    • http://juwolopuga.66ghz.com/velojofimijami.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/mLiehh7/srs_for_car_rental_management_system.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/jihbPxO/day_deals_sites_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/bjegi5A/virojuk.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/gjhhgh8/redapazu.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/60496462386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465905/normal_5fe8103831d79.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/jhehBih/outfoxed_definition_in_english.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/481898.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/grjeZ1z/nedirixomidodoxitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_5fe7d004f032e.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/ejea9Vx/race_start_time_today.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 5352 bytes
SHA-256: 1465fc2efc19a25281e28514b555905fc9464b343e99729e384260a020eda594
font_01_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 10148 bytes
SHA-256: af25501623e7b7fcf0d436d31746a8ca8bce029f1d12d9e42c96027a9019dd16

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