Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f433939dd122b7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 04:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b582a1581c473ed472bea0509a145680 SHA-1: aa2909c290c1ff2dc2f68b47ebb84d1cfbf93010 SHA-256: d6f433939dd122b72d6ac17ead9595d38a2cafdcddc9edde731369f93e199692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file 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 disposable or unknown domains. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://illinoislivestock.org/userfiles/file/31285232136.pdf In PDF document text
    • http://hanart21.com/files/userfiles/file/bobadusojorewozow.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2922926---39088132407.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/gutinidusisew.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161301fcbba469---36850727276.pdfIn PDF document text
    • http://rhondachem.com/d/files/96421336693.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/21821778383.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/49479564875.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/pizato.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/78305321953.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/43437591362.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/30877283385.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/tiboginawawef.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/papoxejedetufekaziveg.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/sowawesosinuwive.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/31356240273.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/93593617615.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_B74F731A270B9966.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/65183044638.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokemigojolopinaripa.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/90953809577.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/noranatafikofifemat.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210909010945.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nejuzowetepapodagelarav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=akai+mpc+app+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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 18116 bytes
SHA-256: 28d01de7a889605f2402b0bb0cff11f7208ff6cc7cd5c87f71fef270a0cdd72d
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 10304 bytes
SHA-256: db620fde45d385874e0e9777789d005eea6352877eb3290acb5007ffbfba09b2