Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8960ee3052940b7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 03:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db285fbe584bc9b5dd328ed04ace9335 SHA-1: a297b3ffa6c91cb10752e77c0c3be5fccec2a196 SHA-256: e8960ee3052940b7a21ebd74438995f978b83f50f928262f43d2fab95b4e193c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, with one specifically pointing to a download page with a UTM term suggesting a lure for 'download psp files for android'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a phishing or malware distribution intent. No scripts were extracted, but the presence of external links suggests the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=download+psp+files+for+android PDF link annotation
    • http://ephtour.com/FileData/ckfinder/files/20210909_D659760585FB7B66.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31026872547.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/sadilaxemisibudigisim.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/sumupa.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/75730602657.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/bezupulava.pdfIn PDF document text
    • http://www.bash.cl/media/file/89757315567.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/35512600558.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/bajomuku.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/42076649182.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/46178058739.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/wewubepitusi.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210911063131_k0oael.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/95790101359.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/11918453370.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/nilabufovokolev.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/bajikosuripu.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/58670465973.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/83999128672.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_4A358EBBE0FDD7E3.pdfIn PDF document text
    • https://lapakunited.com/contents/files/dipuxalegebokejizapaj.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/3323126580.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/lamipupirajunufumutaxakef.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/60399009688.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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 10480 bytes
SHA-256: e2044b130fc4feed74abafba49dc94a13190a9cf3e2b968309659ecb3b4ebb67
font_02_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 17788 bytes
SHA-256: 4d0657fcdeec53234d0e6495c24ef9ab4d467df0501ece4651c35c518403b564

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