Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d742ac82c47321…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 21:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53d409c36da402af23dbf335e024930c SHA-1: 40f0f16dd683d1edadb5aed663e3c986c2943a4b SHA-256: 47d742ac82c4732131bb00b05ca364591e51043c107c8db638dc0e7b617446b2
146 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and link farm characteristics suggest an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate an exploit or social engineering attempt to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jerseyshorepirates.com/userfiles/files/tefiw.pdf In PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/tobadebufoja.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/2780012380.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/64002091698.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/midelalepubotuvixibupot.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/bozapineladutexe.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gudezunamesofotuvenukuzo.pdfIn PDF document text
    • http://cold.lt/userfiles/file/21190671970.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/ziwuvufobopurukes.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_21D74D2DD5E2D8A5.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/80145556412.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/3342637092.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gulagoziz.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021092402273673499.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/81530987753.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/lixiwaxujerilelo.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/56650488915.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/11785497693.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/80239907042.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/74889657970.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4571f1b40---gefabal.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/siferogamobiwa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae043130b8---mugari.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/23550086058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+player+for+windows+7PDF 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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 10716 bytes
SHA-256: 134bb8aa4ab35d8f4e1696ce2d4686038319d549e4c93f8323f9c6a67176ea61
font_02_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 17512 bytes
SHA-256: 0338d71549b15f56424eeb8540627fdb87bc9dc16597870908d9822d0179bc92