Malicious PDF — malware analysis report

Static analysis result for SHA-256 7531aefef5db6fa6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 03:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a02fe6a97dbac45151eff8e32908dc2 SHA-1: 40d34b9e28207e7965431f719b434d36bd73c0bc SHA-256: 7531aefef5db6fa6550058f74c1c8f098b442490d5646b1e45450d950b93b911
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=snack+video+app+all+version PDF link annotation
    • http://studiovalecchi.it/userfiles/files/61233304221.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/4751047460.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/31037641348.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/1949992255.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pinurevuxaxosaxir.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/2622927733.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/duwefugonabapapudunuw.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/76955905223.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/vasawumafigokenami.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/robojisafininitu.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21574432890.pdfIn PDF document text
    • https://efnnma.org/files/file/65011793661.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/62853941532.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/jatovekeze.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/lovafinav.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/fukibik.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/lemamusuxezimuzu.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/viwuxetaz.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/nabidumadepegabibazewan.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/66295691539.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/33334310176.pdfIn PDF document text
    • http://vititanon.com/user_img/files/nopuxarilijevufivixewofa.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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 18604 bytes
SHA-256: 1fc39bee3ffecff9ecd511444c9b5edf1ba951eadf2d0744952feaea07688806
font_01_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 10644 bytes
SHA-256: 284977d2d7e9d21ae7d3aa383e727586bb159a1d6f0b6a7b3e3926c3789c2db5
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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