Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ac49aec77b7729…

MALICIOUS

PDF

97.9 KB Created: 2021-04-21 19:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 031a5bd1d64d8138b5cd433601ed08d4 SHA-1: d4357473aff37ebcf0cbb1ce249f9280f3f58765 SHA-256: 39ac49aec77b77295a3827d9cfcdb7ffa581803f3bfccba5a1ff5bb7f789020e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary malicious URL pointing to vilenefex.ru. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=install+barnett+crank+cocking+device
    • https://cdn.sqhk.co/livaxipovage/hihiiTx/73258766385.pdf
    • https://cdn.sqhk.co/wifavizen/yjpPjg6/happy_wheels_2_download.pdf
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/vusijopomulif-legazodud-gaxutefebajodax-tazejivuzi.pdf
    • http://instapriz365.site/medabe97fsv.pdf
    • http://bbcua.site/kenanpnbx9.pdf
    • https://mipijipibax.weebly.com/uploads/1/3/4/8/134873473/fetusomanosexe_lomapitiz.pdf
    • http://sanatoriy-izumrudny.ru/51140700086vz3cj.pdf
    • http://devivitonewe.sportsontheweb.net/47902425122.pdf
    • http://zoo-taxi.site/bukebapj12j5.pdf
    • https://cdn.sqhk.co/waxobakal/ahfghUn/duck_hunt_nintendo_classic.pdf
    • https://cdn.sqhk.co/nowavutu/Ggihfji/blood_copter_mod_apk.pdf
    • https://cdn.sqhk.co/xuxovunevo/ifkij0M/kmart_pie_maker_rainbow_cake.pdf
    • https://cdn.sqhk.co/wezupobuwab/hihBNwN/41333199114.pdf
    • http://specialsale.info/sazunekeahgc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/156168f2-fad6-49de-8722-08420034a6f6/shark_duoclean_powered_lift-away_speed_upright_vacuum_parts.pdf
    • http://bavatesivo.myartsonline.com/how_to_fly_a_sky_rover_outlaw.pdf
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdf
    • https://uploads.strikinglycdn.com/files/0ee2e45c-2a33-4a5c-88fd-526959ede1b9/zuwajokevimitaxototemof.pdf
    • http://xasejumav.onlinewebshop.net/is_baldurs_gate_3_multiplayer.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
    • 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_off00012ab5.bin
d09b64aaa9bea9b19cda3488a7c183b4c7fa462dc77e8dbcd71b8d5632050828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 5308 bytes
font_01_sfnt_off00013cd4.bin
a1788ba5dbb90cd6a1d4274dbe6e1016cd133eeffbeda575d6ee9328c04a9970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 12136 bytes
font_02_sfnt_off00016563.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16563 16060 bytes

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