Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05ba28a96f36951…

MALICIOUS

PDF

86.7 KB Created: 2021-09-22 20:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7308612f00a27b5fe7bfca1752179328 SHA-1: 36a0946b0e757c8f2e3aa21faa73ee04527328bb SHA-256: b05ba28a96f36951fcdd27e7322628ecda367de1ab32b05a8ffbc0df7720a90f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to malicious sites or initiate fraudulent calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://qualitygums.com/userfiles/file/febejazijidi.pdf In PDF document text
    • http://aquatherm-graz.at/files/fetotuv.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/53476924868.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/28043875411.pdfIn PDF document text
    • http://infosierra.es/images/editor/gitadakekeroku.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/rerigela.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/13080532254.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/32089070564.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/45962888162.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/xajinirom.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb6c078bf---32879561828.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/5759594568.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/20403633984.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/jefokunevurikuda.pdfIn PDF document text
    • https://inks.bg/userfiles/file/85719532739.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac47f270b9---52385773673.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/kijogivirisodox.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/87688975050.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/jojapisikojowemi.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/wodebilifanuxok.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/bidowinozanisaduwobomeban.pdfIn PDF document text
    • http://mopron.ru/upload/files/bolemoxobubopijosorazorom.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/43303500523.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/4052381477.pdfIn PDF document text
    • http://briztravel.com/upload/files/deteduwovokoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tab+all+my+lovingPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 18808 bytes
SHA-256: 91824fffa2414f1c4bcf5417514f13e8fb9a8e2484cbf5686be33374ead593fc
font_01_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 10236 bytes
SHA-256: 75df0e66d85169a99f858e1c8af1c449f703f9605c6d862738b128678f10a725