Malicious PDF — malware analysis report

Static analysis result for SHA-256 90990cfacb744359…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 11:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4fbb992b62da1656f5931ed079ef665 SHA-1: a8f96d15212252760d99bd81fff3e6ebe2b4d8d0 SHA-256: 90990cfacb744359f99a7ff01bc2d29f739badb3a6cc2ce59ebc3a5101fe4de9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, suggesting a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://rosettes.it/userfiles/file/panuval.pdf In PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/5439774423.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/powesoxosozozugetoxinapuv.pdfIn PDF document text
    • http://dgjst.com/upfile/file/kadufilozoxerugivefipami.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4cc4bc4c3---12618902929.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/derikom.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/lukemizazokazorolazixa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/32940334466.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/52027973042.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/fulubilusefetaxa.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/sibiwidikix.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/28025112318.pdfIn PDF document text
    • https://sitarasign.ir/data/file/boluvod.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sekitagedolevi.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/vosuzexatobasit.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/jilusuposi.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///duseluve.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/mised.pdfIn PDF document text
    • http://taociren.com/upload/file/210910071314725436lch9jtir984a.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/48297792701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+pair+android+bluetooth+with+carPDF 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_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 10760 bytes
SHA-256: 76846cc9162afc1eb10a31aee676752d7c30adbdc698ab4d6da1b2754cdaa528
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 17540 bytes
SHA-256: 77392a76a2b25ab097f59ec2e9103d8a4d6cdae29de311fecbad3c88af74b201

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