Malicious PDF — malware analysis report

Static analysis result for SHA-256 438ffcc761dbb153…

MALICIOUS

PDF

88.6 KB Created: 2021-09-14 09:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0db4ae13375a3752d340874ca27cf4df SHA-1: 8ae7173b1924f7e93fae1173cf30d24f1d186d9c SHA-256: 438ffcc761dbb153f992c81c6fff90dea8d7626a516badcc088b1d09bf0652cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'pixomot.ru', suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF acts as a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=offline+rpg+adventure+games+for+android PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366fe25b52d---kafebazej.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/libovaboveki.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30713813037.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/vujubululuxagimow.pdfIn PDF document text
    • http://progetec.org/userfiles/files/dujofuguse.pdfIn PDF document text
    • https://securitydm.net/slicice/file/lebobufig.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/pikumumimudowinususapuxi.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/37304824062.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/xenokipojivozetiroxomu.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bigabixik.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jerepotominogeje.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/28995825704.pdfIn PDF document text
    • https://btegypt.com/file/35817725619.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/marejorudekuje.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/2207648821.pdfIn PDF document text
    • https://netpage.info/userfiles/file/20992168186.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/xutabomomidibalino.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/2894173490.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jebisoridemesolomab.pdfIn PDF document text
    • http://zerosquareonline.com/file/27460591738.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fedujojowoneles.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tevavuxokupel.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/jasodefipinikonopewu.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_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 11032 bytes
SHA-256: c9e82cc86d8b42f83e3eb6e6c4826f720fda2366f184900f02ff76fa6da56a1f
font_01_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 17116 bytes
SHA-256: 212f0a950f315dfecf1209c4826c2672c49b42db2f140e32ce0dda1c405264ce
font_02_sfnt_off00013c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1