Malicious PDF — malware analysis report

Static analysis result for SHA-256 6414c0b21e8de89b…

MALICIOUS

PDF

98.9 KB Created: 2021-04-18 02:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e8a79975e7e152ba62dc5ca2fbdbb67 SHA-1: d7168911c8955bbe8fb64f2ba52c212199d7a0a6 SHA-256: 6414c0b21e8de89bbcc52c80fb5e052ddacf6d1cd1e37bf7ccc98456df4e24dc
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 generated for SEO purposes, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to external resources that could host further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jacksth.ru/strik?utm_term=texas+instruments+ti-84+plus+backup+battery
    • https://cdn.sqhk.co/zogobadakedu/O85hchi/galaxy_at_war_online_radar_station.pdf
    • https://cdn.sqhk.co/pumafuki/ghrVgiz/37004980454.pdf
    • http://xemizawufogutuf.scienceontheweb.net/80463599048.pdf
    • https://cdn.sqhk.co/bojojiweg/jnijidU/81792170754.pdf
    • http://kilijosizujowo.medianewsonline.com/chemistry_atoms_focused_approach_3rd_edition.pdf
    • https://cdn.sqhk.co/semiwewedazi/hj4PhhQ/war_of_independence_short_definition.pdf
    • https://cdn.sqhk.co/dokadajij/dxahbSu/implosion_never_lose_hope_mod_apk_data_unlocked.pdf
    • http://muzibatixabu.mypressonline.com/caracteres_ascii_signo_de_admiracion.pdf
    • https://cdn.sqhk.co/minofavazu/iehdqgg/45409548293.pdf
    • http://nowukusox.mypressonline.com/auxiliaire_etre_et_avoir_au_present.pdf
    • https://cdn.sqhk.co/woxezelej/XsMUicX/deity_fallen_facebook.pdf
    • https://cdn.sqhk.co/jedepazisu/gheZzh2/followers_and_likes_tracker_for_instagram_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_12807cdd624f4f2ca315ff2bc47aa689.pdf?index=true
    • https://s3.amazonaws.com/fifomi/white_fang_1991_full_movie_dailymotion.pdf
    • http://kadoxosin.atwebpages.com/difference_between_diamond_and_graphite.pdf
    • https://s3.amazonaws.com/sojebelevenex/kenmore_elite_he4t_washer_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/df0e340a-efda-430c-b455-7a1e9da2a48c/pinebajudi.pdf
    • https://s3.amazonaws.com/rekawexuretowo/romeo_and_juliet_act_1_scene_5_quotes_tybalt.pdf
    • https://s3.amazonaws.com/vavejijitatofu/jogokujufigejajupovi.pdf
    • https://uploads.strikinglycdn.com/files/dfc5dd90-8776-4f55-b716-ae46f5f6fd29/free_xbox_live_codes_2019.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_c5a1688882b54408b6bbe68c3ad0b0ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1fad03eb-4b93-48b3-af93-c68183d21040/rewugedatuxasunev.pdf
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_7f1f136b4bf6492f93a1935a3a686f04.pdf?index=true
    • 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
font_00_sfnt_off000127b9.bin
8a0229805b60a8c15d47eebdcf1674b093933fd4029078c9509d1ab321e76c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 3440 bytes
font_01_sfnt_off000133f9.bin
f2d5ff123ec11d03bf3eee4c4f76d28676be3e7daeaac8732b4d93fe4e409fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 5488 bytes
font_02_sfnt_off00014692.bin
9246c0cbfb91ecbc62dddffdd93781148853aec6af91b971090cc00dec40b5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14692 11836 bytes
font_03_sfnt_off00016ee2.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE2 4324 bytes

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