Malicious PDF — malware analysis report

Static analysis result for SHA-256 8658f5a83039f88b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 18:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8381905b75e1b4c217a19302d26eabb3 SHA-1: bd1801ba19b28f5c979d39c889ab07d228171c8f SHA-256: 8658f5a83039f88beafd40d7ec2b80f5a1ed6741d92943be61c1c6af872ee4c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs pointing to disposable domains, as identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests a link farm designed to obscure the true destination or distribute various payloads. While no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=domino+master+mod+apk PDF link annotation
    • http://tiquital.com/documentos/file/momovofenefobus.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/91163900127.pdfIn PDF document text
    • http://plise.org/userfiles/file/14961319160.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/gamixamuzonekaroxazavuwut.pdfIn PDF document text
    • http://health-bridge.in/upload/file/levog.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/3359180036.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/lofunaw.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/xawop.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/ruwejoxode.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/gutoneza.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/45085221385.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jetupesepixidekerujitif.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/vobebi.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/rebibunenoniz.pdfIn PDF document text
    • http://abwrva.com/uploads/files/63242116658.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/78993932643.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/73314994255.pdfIn PDF document text
    • http://wdnederland.nl/file/11091108885.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021941751503809.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/975939681.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/rutuvaluzozomazumamexarux.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/11509546248.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/xukozutilasageweruriminon.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/13954157323.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_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 10600 bytes
SHA-256: 61cdeab225f52e463e009158b7501b73e8439f3e5b026f5e7c0b762019a690fe
font_01_sfnt_off0000c647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 15036 bytes
SHA-256: fafbc8d31fa74b8d7080aeea950c8111a123888b7645738ffb7645469b9dda55

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