Malicious PDF — malware analysis report

Static analysis result for SHA-256 904614ce08107449…

MALICIOUS

PDF

119.0 KB Created: 2021-10-04 17:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94d50981fec2bc1e08444407062b0cb7 SHA-1: 0c5ac90c9f2b5c053ab23d901eaee71779cbe126 SHA-256: 904614ce08107449a1ba78163c03b4287c724bf90085657788dbe6a61de9bec1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://vektor-bezpeki.com/userfiles/files/70810699242.pdf In PDF document text
    • http://righetti-ticozzi.it/userfiles/files/xakosom.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/zozufav.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/poxulufufitepatotepiko.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141397d4af9a---mefesud.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/32370886177.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/60559227833.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/wofijolalapeje.pdfIn PDF document text
    • http://scsychem.com/upload/files/33399715562.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/noramovaz.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/lovaradomuxelen.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141196f45ae7---1222777666.pdfIn PDF document text
    • http://mylead.mandiricareer.net/contents/files/24693807038.pdfIn PDF document text
    • https://stvorki.ru/files/file/95075542577.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/42997632952.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/60280585749.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sekibiwev.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/21308466574.pdfIn PDF document text
    • http://tchid.net/userfiles/file/6383506064.pdfIn PDF document text
    • https://service-panev.com/userfiles/47822861377.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zaxupuxiloxagepemegazibil.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/54665373812.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/tobomolapogeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lucifer+and+eve+childPDF 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_off00016bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18405 10308 bytes
SHA-256: a926a4e4be13a03003e90588e154c5125fc72f7d31d1e09db1943adbb5d5fc3a
font_02_sfnt_off00019b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B19 19884 bytes
SHA-256: 9e8be2b9d04a407b575906b6e0ca9ea053e9d6157bcb2032587a60406266f1c6

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