Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af6d2e226d7b724…

MALICIOUS

PDF

76.7 KB Created: 2021-03-30 14:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca8d4723e77c5d0072c5b46826f7a1f SHA-1: 4762552aebd4682bebf35eeb4bf3ef29b96ff36c SHA-256: 2af6d2e226d7b7241d77350be87d0572629ee92d5e1c8c87b192b164647c96ae
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are part of a link farm designed for SEO, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL observed is 'https://zajinet.ru/award?keyword=novena+arcangel+san+rafael+pdf', suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the presence of numerous external links and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=novena+arcangel+san+rafael+pdf
    • https://cdn.sqhk.co/fumamimed/aJjjibP/gmail_sign_in_android_studio.pdf
    • https://cdn.sqhk.co/serodozire/ujjhgjd/7217254547.pdf
    • https://cdn.sqhk.co/tiwoxebu/gORie5g/wilton_cake_decorating_tools_set.pdf
    • https://cdn.sqhk.co/dasofuduveje/YbHhj12/viridian_arlington_tx_reviews.pdf
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/872c0.pdf
    • https://cdn.sqhk.co/kelopifagisu/ghijjhj/steam_tools_mobile_app_not_working.pdf
    • https://desagudag.weebly.com/uploads/1/3/4/6/134676200/1156540.pdf
    • https://cdn.sqhk.co/kixagixupo/LIgjjhg/simple_sandbox_mod_apk_1._5._1.pdf
    • https://cdn.sqhk.co/benanejufa/jgjthad/7430776699.pdf
    • https://cdn.sqhk.co/narulaloro/yClicU0/546966840.pdf
    • https://cdn.sqhk.co/wazafanez/0hdidhf/38794110458.pdf
    • https://zokokemakate.weebly.com/uploads/1/3/1/4/131454090/ec308378724db43.pdf
    • https://cdn.sqhk.co/gupimupiset/4hgjfAU/bidunirut.pdf
    • https://timitadenemegi.weebly.com/uploads/1/3/4/7/134728598/15fa0b3c499.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nuxajirurus.epizy.com/2011_toyota_rav4_known_issues.pdf
    • http://rupeguv.epizy.com/game_design_merit_badge_pamphlet.pdf
    • http://vasizofotobobem.rf.gd/51004610526.pdf
    • http://sujotoginejo.rf.gd/aomais_sport_ii_user_manual.pdf
    • http://mejesikiwabez.epizy.com/dragonball_android_19.pdf
    • http://vogokibogewete.epizy.com/how_to_stretch_for_workout.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_off0000ec65.bin
8dc4e66d3b1650d832923f88afafea68412954104e79b8fd0e2c8b261df70ba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 5352 bytes
font_01_sfnt_off0000feba.bin
bf06d4aa650d133ced9e766944e83d701e5270fe210cfb6af3db1d4ec7599a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 11536 bytes

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