Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17e4d3b8b3db67e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 15:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b4160eb3bac865a541833e0041e80a5 SHA-1: 1f60192bb1b3be151878ae33d151266cb06bff06 SHA-256: e17e4d3b8b3db67e34e45f3c787d3738a34d61053a1b5812c57e45d3c90de538
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://smidgel.ru/uplcv?utm_term=timeline+on+android+phone PDF link annotation
    • http://www.jindatunnel.com/up_files/file/83675811365.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/94305925036.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/17500496126.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/50535000995.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/89840700224.pdfIn PDF document text
    • https://topupdana.com/contents/files/98208584672.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacffea6eb---87624066873.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/sovubevetopo.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/giwopegeluxabaleleboj.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/7015528656.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/fozogibelisezowufe.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/32889790448.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/gobumunoretetamegapiri.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/gikeda.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xilok.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/60397198138.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/91033261240.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/walefevepazafepekepo.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wisesi.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/sabomegebukobotelixo.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/pakumudazudefuzipagimutop.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/58907687008.pdfIn PDF document text
    • 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 17620 bytes
SHA-256: 0381b14b8463246019e1f32d75f3a9e208a6704061af48ea0f21bd42dcbe293c
font_01_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 10356 bytes
SHA-256: a224f49ad7211f948ebb5d4e4216fe2b65d501b487c87f891948db148883962c

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