Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bfeab393372958…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 03:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 748b4e8dd807c68da0f7f4f026b31461 SHA-1: bb3c288d10c43761157a00ac1d1c70f0acc26ff3 SHA-256: 77bfeab393372958bc404d660d681ba52b56b4cc108ce9633e43ff72322b8b31
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a link farm detection and a critical ClamAV detection. The document contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting an attempt to redirect users to harmful content. The presence of PDF_URI and EMBEDDED_URL heuristics indicates the document's primary function is to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://globalybm.com/ckfinder/userfiles/files/1631491253.pdf In PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/fifemeweruzulilupetik.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/warekakedamuxenaj.pdfIn PDF document text
    • http://gyliver.ru/files/files/fabaruwep.pdfIn PDF document text
    • http://normel.org/files/upload/file/33040162959.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xiben.pdfIn PDF document text
    • https://sinarwaja.com/account/files/69429494461.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/febopabibudavi.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/banegaviwa.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/tapamozubezutamilidasuxas.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/siborebetepewavabidapego.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/82518330857.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/37407428674.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/putevizexijotaf.pdfIn PDF document text
    • http://belean.pl/userfiles/file/36405726404.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/67113054679.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/zotosunefawe.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/46046868622.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/milebubotowes.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161303a82b26ae---gigupepuwozo.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rurapixilixelimiwuw.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/gimusepinabatuwapumigako.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/vepofaxu.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/7108880676.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/89512838898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+hitman%27s+wife+bodyguard+watch+onlinePDF 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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 11360 bytes
SHA-256: c02626771164c5df0ddd10e8657c58614feb0c3ac8ee35eac228621c8043f943
font_01_sfnt_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 15464 bytes
SHA-256: 03a41dbd6eee3969a02fb26429e5fe446c11c4699547648ab190d126455be76f