Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec46ee7e01846468…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 10:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0cae090b0c5a5ffbfb0a96245fcf8e1 SHA-1: 23e8ab61fa4feda757acbc833030b69631709c17 SHA-256: ec46ee7e01846468fe2541b63ec906f4d3121616b2bd7d7707ee880346f53846
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'link farm' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=win+7+ultimate+x64+key
    • https://rougezenekar.hu/files/file/39618189043.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3830d92d2---kukesavepu.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/detoxarafafutu.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/77002288391.pdf
    • http://rafaelstore.ru/upload/files/46555107155.pdf
    • http://enovosti.info/ckfinder/userfiles/files/lurare.pdf
    • https://pt-joker.com/contents/files/80500980582.pdf
    • http://dental-forum.ru/userfiles/file/74514086024.pdf
    • http://canadianartistic.com/userfiles/file/wafejapo.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/nokujabupedopuj.pdf
    • https://ijaetis.org/ckfinder/userfiles/files/81503373929.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133621da8f56---55410825640.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/8489417903.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/39516823057.pdf
    • https://solelane.com/ckfinder/userfiles/files/63598133775.pdf
    • http://tccsrl.org/userfiles/files/30849258245.pdf
    • http://cesurmakina.com/userfiles/file/memokigusibad.pdf
    • http://kengosushionlineorder.com/uploads/files/tuvetax.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/3753057641.pdf
    • http://s2group.pl/userfiles/file/xaviwotuxukezego.pdf
    • http://ozhelalikram.de/resimler/files/16083483175.pdf
    • http://zajazd-broadway.pl/galeria/file/zobevijerasobebug.pdf
    • https://faresaldabbous.com/uploads/files/dapifizegu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af36.bin
3449ec6edcc1463ec2151b0c0f5cdf5b141d52467f2606cc8d901ca987ac3283
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 10576 bytes
font_01_sfnt_off0000c771.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 16792 bytes
font_02_sfnt_off0000df83.bin
385f25ceb55bee8098c38180d247bb60717203bacea10cfad9792f0427dbcaae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 15832 bytes