Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbfeb872566d430…

MALICIOUS

PDF

75.7 KB Created: 2021-03-01 14:38:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85a8755050a150cc9a5c2b8234b03070 SHA-1: d897a4f1814a9a2b573330a02c5957eb255fdfba SHA-256: 5cbfeb872566d4304a2a9cca3f6817bf8cd1b069e036ce42e5f5dd41218a9ef1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate PDF documents, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://leonvi.ru/wix?keyword=navy+jrotc+near+me', is presented in a way that mimics search results, aiming to trick users into clicking through. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=navy+jrotc+near+me
    • https://cdn-cms.f-static.net/uploads/4463308/normal_601cdc7e5fe56.pdf
    • https://cdn-cms.f-static.net/uploads/4426088/normal_603ccad5a67ff.pdf
    • http://fexevewuli.mypressonline.com/revolution_2020_real_life_characters.pdf
    • https://cdn-cms.f-static.net/uploads/4460461/normal_603c086e440d8.pdf
    • https://cdn-cms.f-static.net/uploads/4380223/normal_6012b0bf186c5.pdf
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/8330241.pdf
    • https://cdn-cms.f-static.net/uploads/4375093/normal_602abc68b1dd2.pdf
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fcc4115262e7.pdf
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/37fcd6eb73.pdf
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/e1ed37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kogawazer.epizy.com/how_to_draw_a_simple_tree_without_leaves.pdf
    • http://lopilizunutevo.rf.gd/how_much_was_mj_worth.pdf
    • http://zamoguwudegovo.rf.gd/django_template_dictionary.pdf
    • http://bonubenevutura.epizy.com/seat_drive_app_android_auto_apk.pdf
    • http://fuzadakeju.epizy.com/free_division_worksheets_without_remainders.pdf
    • http://fojakosi.atwebpages.com/are_snapper_lawn_mowers_any_good.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed56.bin
5bb55ce16002d5f68e22951b3e68e8f404ce7f59c175d9cffc0a74a6822ec765
pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 4940 bytes
font_01_sfnt_off0000fe27.bin
cc119afd834256d6518c2b30802c640e94b95729d7c0634888244ccf93c65876
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 10656 bytes