Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2743d9cfe8e1270…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 06:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 743581990fc384fa6e6faa6fc597db06 SHA-1: 4da2d3b834330fc938b2ba1742f467dc40c7e168 SHA-256: a2743d9cfe8e1270726539430d8df859eebf223700672b7b50795749df5e3643
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and containing embedded JavaScript. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing. The embedded JavaScript, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality, potentially by downloading or executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moiatakashta.com/userfiles/file/wuvuwagegirevisijaj.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bc35b69c---teramoroziroguxerigupiza.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/57401973471.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/96950625709.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/nuxan.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/42161901443.pdfIn PDF document text
    • https://wrd13.com/force/file/18700887291.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/76267265832.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ff69c43e119927411ad08fb9eabe8a32/22015697157.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/48234489935.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/64450880183.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/kijaveke.pdfIn PDF document text
    • http://dezis.ru/uploads/files/84498000036.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/nexebanegebelitilibased.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/53420989494.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/61720787386.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/12822708307.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/39176018946.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210910_BEC4D00DE873C533.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/26069365298.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/57102829034.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/revari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+protect+my+love+mod+apkPDF 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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 19336 bytes
SHA-256: 560fcf4f00b54f47db83f4e36b6d9fa7d83ebbe05f28ae3a52b47cbc576a7650
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 10776 bytes
SHA-256: 2ea42e1c1644315fb497ab77a0eb184370e311ab3867fa97c90aa28ab0450c32