Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fada080ef1df972…

MALICIOUS

PDF

89.8 KB Created: 2021-09-18 03:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a1b51517c1769199ef2870dcf9372ba SHA-1: 229125d7287b2dede12bc4f945da8bcafa2d3500 SHA-256: 9fada080ef1df972d43000f2bfca4f9770dfeb3a342e06040b057e1fa1b29aec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://eldorautomaticgates.com/UserFiles/file/14138143956.pdf In PDF document text
    • http://malbreil.com/userfiles/file/3074806884.pdfIn PDF document text
    • http://synfarm.com/upload/files/34244271778.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/lipefebepomegisexizaje.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/59447234504.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/85580958918.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/wejupefederusopenuluno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cfc53069---melufofesuwekamupit.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/xoxonizirajarakuw.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/61126358149.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/40613967229.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/41955921946.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/47756683360.pdfIn PDF document text
    • http://nensi.si/upload/file/vikoxefute.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/11013221383.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/povegimopeju.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/bawigesuriruwotun.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210911090248.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/c9588c3445b901171ab66f3821d88183.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/gutatawujediw.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/mokokuguvugoboberuwita.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/furevowekajozefupavudawa.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/kukowibonuzusakib.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130455273e11---27757438148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pc+ported+games+to+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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 18608 bytes
SHA-256: d6714b2b7aac135b027c5206bd1c69dd104b20d49561b7763eb83edd2b95e45a
font_02_sfnt_off000140f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F2 10812 bytes
SHA-256: c59a78df973f7c9e4abb365574896b4e24836aa2c521760c27cc228d9e244f1d