Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d6026406fae5e4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 15:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfeb0b601ad3f2161ef5b1b32be4b4bd SHA-1: a581712b624dff6ae1d7bf25a04de27141511d7c SHA-256: 94d6026406fae5e402ac2986a3cd2f901d4eaf5b4845453e0f00ce640f82ad06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a likely phishing or link-farming scheme. The PDF structure and the presence of numerous external links suggest an attempt to lure users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://irlanc.ru/uplcv?utm_term=best+online+2+player+games+android PDF link annotation
    • https://www.igescanada.com/ckfinder/userfiles/files/62217658979.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/75036410289.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/ninezugatonet.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/7315694633.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/papezeb.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/64348320743.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909170637775964.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/gagilexazikowetep.pdfIn PDF document text
    • http://vladekoservis.ru/files/fasoragapebum.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/92005584659.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/23615928781.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/wojimatawozodowiviw.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/63004230821.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210901085838.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/sutewisut.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/wababufo.pdfIn PDF document text
    • https://estoniapools.com/contents/files/76679877659.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/46769208191.pdfIn PDF document text
    • http://soles2walk.com/data/file/79710531254.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/depefarelela.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/17690992567.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/majudilenufepujutogaguz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614800cbdf170---4267604082.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninewusewetakiwutit.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_off0000b160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB160 11024 bytes
SHA-256: af9ad7d80ace8315492550cfe8fc9279cfddd6995d53f0553a2c357c38d3af5f
font_01_sfnt_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 16716 bytes
SHA-256: bde1c2689300ee4bb6a372d5d981b1858eed44e8c22f61e2a07e5edf73097352
font_02_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1