Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f488e4ad7a86f8e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 20:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7aabde47d4fc3b9b609b5f07ff275c7 SHA-1: a61a8ff218a48f51c2863ad097ed8ffc81d0ecc0 SHA-256: 0f488e4ad7a86f8ec9afc6e71296a62fabc44b1533d499e5a3e15227ead63359
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to external PDF files. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=download+film+a+quite+place+2018 PDF link annotation
    • https://bellcera.60km.com/upload/files/varosatomojiwatef.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/9916968068.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/80813349552.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/lejigek.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sa6a1l1omq3v902942p303t8p5/78637774843.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/25557275424.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/sogadejisus.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/88439232465.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/22942663550.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/danaveto.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c684c4eea1---70051734472.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/25521696790.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/29589273566.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/82323923587.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/3776738228.pdfIn PDF document text
    • https://camelcarpet.org/d/files/78350177999.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/tisulufemadupevisaz.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/52155085873.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/39257273731.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/kagitugevobitupin.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/mizoguju.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/94761687231.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/mogizudemumutud.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://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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 18116 bytes
SHA-256: 3254ede147af63e8d643e429829978837a8b334674a36d3c864dee5dd43e6688
font_02_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 11348 bytes
SHA-256: 4178f0f6dae8fce5eafd20462adfff6ef0e7ab5e083dc216cb0633e3569b5b77

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