Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2552089c651cfbe…

MALICIOUS

PDF

106.3 KB Created: 2021-04-19 11:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a5d9bc60db7dad87b99406e3acc877 SHA-1: 5837c45971a43492c43e22724b8101883bc17457 SHA-256: b2552089c651cfbea236d62d568da17e82834a1b8f961eb2d7bfc67e2d38e64a
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 with numeric or keyword-based slugs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=irobot+roomba+e5+manuale
    • http://luziniwanemek.sportsontheweb.net/41202451235.pdf
    • https://cdn.sqhk.co/kagelemovo/jgCgdic/attack_of_the_drones_objectives_level_4.pdf
    • http://wejuzofibab.medianewsonline.com/bacille_de_koch.pdf
    • https://cdn-cms.f-static.net/uploads/4427267/normal_600a5658ec663.pdf
    • https://cdn.sqhk.co/tiwoxebu/U1gijft/gems_for_pixel_gun_3d_tips_2019.pdf
    • https://cdn.sqhk.co/buwisotubu/goL8hjO/learn_javascript_faster.pdf
    • https://static.s123-cdn-static.com/uploads/4387704/normal_5ff3da8a5351c.pdf
    • https://cdn.sqhk.co/basinasedu/jagidyh/vutoxoba.pdf
    • https://cdn.sqhk.co/dibirolinu/0IOieEv/function_generator_ic_max038.pdf
    • https://cdn.sqhk.co/zojixemem/W1jhb4s/download_games_game_of_warriors_mod_apk.pdf
    • https://cdn.sqhk.co/zilidadakole/ieOijIB/candy_camera_old_version_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fd11d0625b1a.pdf
    • https://cdn.sqhk.co/xupodafib/j2zbLjj/clouds_lyrics_joni_mitchell.pdf
    • https://cdn.sqhk.co/dazibewibu/6VhiwmE/mini_basketball_hoop_hang_on_wall.pdf
    • https://cdn.sqhk.co/totafeta/ibiahgd/jotixibidoxobusupiwe.pdf
    • http://jetinaxisodew.mypressonline.com/42382343893.pdf
    • https://cdn-cms.f-static.net/uploads/4366042/normal_601a9a8b73c7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_76e68ccb387f447482d82e0edc9011b2.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_97283fbba5884d109ddbe697b28088ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5da6454f-cd2a-4a5f-90b5-1bfadc54a901/gone_with_the_wind_sequel_summary.pdf
    • https://uploads.strikinglycdn.com/files/b575a118-cc63-4db6-a82c-6ade839782f9/what_are_the_most_important_events_in_australian_history.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d16d.bin
c810255713674c3aa79065d71bef0a63647e9d25b7745441fc37eb86031ec7d6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD16D 44784 bytes
font_01_sfnt_off00015a78.bin
1a581a0dd0cbb3812c3289ca01fb82d2abd86547612215aca7629c35a5bd7deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A78 4688 bytes
font_02_sfnt_off00016a41.bin
3ad4d080ce0de3703c137c555d43977a4cc507a4d5f7c32bc64b438d70d5a4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A41 9576 bytes
font_03_sfnt_off00018afa.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18AFA 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.