Malicious PDF — malware analysis report

Static analysis result for SHA-256 030c82172d9dc0f3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 18:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce63ba259f31a06767ffd1c524160786 SHA-1: 827283b58dbcdc0c4b961f2d8232400d8e1bf46e SHA-256: 030c82172d9dc0f3976fe0b63aa551e7b17a56e8cd29e3fadd47b3205b733f76
146 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish users. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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
  • 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://vipbeachhouse.com/uploads/editor/file/86510461811.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161409e0a70974---ginojoputuwa.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/96301941105.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/lovekesuz.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/10259011167.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/31921101507.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_667D1FC5C7DFE3AF.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/58325686479.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371264ec3e2---53690599344.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xasiwasewol.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/10325928629.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210915182323.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/toledumejewokelakuxix.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/25296141184.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/82169041591.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210921023737.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/30600600431.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gavozodijasowubegexarel.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/sojezavumunolop.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/33550541477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spider+man+homecoming+game+for+androidPDF 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_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10832 bytes
SHA-256: b1518d74342066b94e0e553200009c526fe0ab046755e4fcb5b1abd4d4f5dfc0
font_02_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 22132 bytes
SHA-256: 89f221a2cc82c45ed39490ad14dd4ab1b61ad77f43a5b75f38c833fb7be2724d

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