Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4e78e303c0a71b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 14:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b131f2402387df31e277481e085ac2c SHA-1: bb2a236761952723bb2371b09b6f12388bcbb987 SHA-256: 3a4e78e303c0a71b0b6d285900a7b743adb8b4db9c091afc496a2a189bfa0148
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback lure. The document body is heavily obfuscated, but the presence of external URIs and the callback lure heuristic strongly suggest a phishing or scam attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to facilitate such attacks by redirecting users to malicious sites or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=beautiful+azan+mp3 PDF link annotation
    • http://sm.ac.th/ckfinder/userfiles/files/84077080052.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/dijewadazaw.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/rulifufit.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/81859838494.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sojajusosimotane.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vegosuvetatimifulu.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/99275568332.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/guzinusobawi.pdfIn PDF document text
    • https://sharenkon.com/files/5182495591.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/75490416642.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/gozuze.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/87847292713.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/kaluk.pdfIn PDF document text
    • http://retailcop.ca/files/lokegowapuxomujijuk.pdfIn PDF document text
    • http://espokebar.com/uploads/files/55478327471.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282b764986---ladimuparufagimupuzibu.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/54780472104.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/13790332105.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/39413326502.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/80579867262.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/84435089129.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/61799476818.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161380b502dbda---81890150531.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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 21564 bytes
SHA-256: b70a21ab23fb49373ba481c7bb4e2031f3d19e155439f63330d0ae5537e2f958
font_01_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 10516 bytes
SHA-256: f479e524358d806e3aff105ac3bc80f3359442bcdce1fa91a11381c9be81b6fc
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1