Malicious PDF — malware analysis report

Static analysis result for SHA-256 9004e2c05ce6a49c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-13 21:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f08dd0ce6a33e709d06a5a1ac353840 SHA-1: 9777a14127fab19f596847f6568891ba8119d066 SHA-256: 9004e2c05ce6a49c63e4578a7227d5ad38148230150399801aeaab8912c6ea47
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown domains, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a structure aimed at distributing links across disposable hosting. While no scripts were extracted, the overall structure and detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://decaiyun.com/upload/file/210908102647156552ri0ht8v8nl1v.pdf In PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nitetijoxironeja.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/76614302288.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/bezelomoverubunogi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jutivizojafe.pdfIn PDF document text
    • http://quetthe.com/upload/files/37569269007.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/dugurexoxesupiv.pdfIn PDF document text
    • https://spacio.hk/attachment/file/21069938073.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/44256862969.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/80522573962.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/16916008898.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8bf9d364---67998650342.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/tuxilofiroregoriwimez.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/3208729758.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/vovawagiseridenamorutoro.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/kabekonumiropefuwat.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/4321024054.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090822490173499.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/fajazirigagewesaveti.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/godunobazonejubatoxotenel.pdfIn PDF document text
    • https://suruburi.net/mm/file/88172606772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chawl+house+all+episodesPDF 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_off0000c0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A4 17148 bytes
SHA-256: f3b1e47386f4cb8bb722dffbcad0e335aaa29b255e926cabd62834255276aa74
font_01_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 10404 bytes
SHA-256: d0446afb14e07d4ade8cc335239869657a173f5c413aa6bdf2eb9a14ba4e0f37

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