Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d09367b56e3a7f…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd491d02e00f36d6c13e5664f7371b4b SHA-1: dc984c86b0a0e7dd008ac232b59a55b7cd17c8af SHA-256: 75d09367b56e3a7fecf9caca5b5c5e62f9a252eaad6e77e5104b8f980f398290
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://thunderstar.cn/userfiles/file/20210910135936858053881.pdf In PDF document text
    • http://mycoapaisyl.com/webimages/files/67722762173.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valovurapopajiworise.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kaxawopiwujawo.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/68849077009.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/riboxak.pdfIn PDF document text
    • http://azizolace.cz/images/file/kubukuga.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903142811834271vjl10prm57gl.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/91395983948.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/93474158466.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/75649656495.pdfIn PDF document text
    • http://jucal.es/images/file/30065568729.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/614930a359fe0.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/faruwesuvazewufawumodinuv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337c4359910---weloli.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/17568533556.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/miguwugutelosumalebugi.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/radamuzagawe.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/28577213700.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/96423498877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hot+pink+color+codePDF 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 18720 bytes
SHA-256: fb0d1eb861f61bad3f3bce3210e9e5fa6bfaaea40753422cffcfd2ed331639b6
font_01_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10260 bytes
SHA-256: 8165439ee7fb4503d07dca3004f29b0d3d7ae052caf9b3028e50d9cae5f483be

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