Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9543e8b8b83d28…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 12:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c332f24de067bca3712856e9282341b SHA-1: 36fbe1a04a2901746a40efe05e3695e39dfb31c7 SHA-256: de9543e8b8b83d2846b6e5208afb9812999b1b0bb5c3dce031166284b42f470d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical and high severity heuristics indicating it is a phishing trojan. The presence of embedded JavaScript and a large number of external links, many pointing to unknown PDF files, strongly suggests a malicious intent to redirect users or deliver further payloads. The document body was unreadable, but the heuristics and URLs are sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://securitydm.net/slicice/file/nawomasitejasuf.pdf In PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/32343394060.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/soveturum.pdfIn PDF document text
    • http://berbun.com/user_img/file/wekugumegavib.pdfIn PDF document text
    • https://migger.dk/userimages/file/88227586285.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/69927636740.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210901_181A0056C7A6336C.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/sobaxaxirikonu.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/28972462614.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/40414367739.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/48850518291.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/49260937383.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/90019635173.pdfIn PDF document text
    • https://fototipia.hu/files/files/fiwedazesedelixarilirenib.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/jorogifux.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/bijep.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/zekogexisuralax.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/temojiju.pdfIn PDF document text
    • http://vhshf.de/File/77513639352.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/85465066520.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/21574926525.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313385f057d---dogovitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+bodyguard+from+beijing+full+movie+english+subtitlesPDF 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 11316 bytes
SHA-256: b891fd73296994befebe6a05a4a5c88f5026d7b836e006e426220af40b5775bb
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 19024 bytes
SHA-256: bd165955379f31f2eb588d69df8f6e6a9f791707fcc6a82c58a3066ad0207b7c
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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