Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36db55eef4a5339…

MALICIOUS

PDF

86.9 KB Created: 2021-03-25 10:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f3961f35058d1451182027ac2db727 SHA-1: 8fd404e77cc17b13f62d2f1c0d0bce9adbef677c SHA-256: a36db55eef4a5339efdc591166c013f6183a68d15d90ff7da9dbe1a9e40db159
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 point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/wix?keyword=greatness+guide+robin+sharma
    • https://cdn.sqhk.co/busanurutar/QkNggUr/mitabutajaxu.pdf
    • https://cdn.sqhk.co/xerejijasoma/bQhhDjg/segun_wood_bed_design_bedroom_furniture.pdf
    • https://cdn.sqhk.co/maxegugej/gi01gji/galaxy_attack_alien_shooter_free_download_for_pc.pdf
    • https://cdn.sqhk.co/nomitusibop/8miMic5/14246715484.pdf
    • https://cdn.sqhk.co/xaduwudixum/jdZnhig/swing_shift_movie_soundtrack.pdf
    • https://cdn.sqhk.co/jivonotiso/zvRehbX/superstars_wwe_anime_wallpapers_hd.pdf
    • https://cdn.sqhk.co/besiwowegin/iighkLO/war_in_space_game_unblocked.pdf
    • https://cdn.sqhk.co/kovezozeseg/YImzif4/zixariba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2e720aa2-f055-4f31-b185-1001af8c9fb3/dirt_bike_125cc_2_stroke.pdf
    • https://uploads.strikinglycdn.com/files/d921bbcb-8c09-4af8-ab18-bf929e34428c/what_is_the_mailing_address_for_form_1040.pdf
    • https://uploads.strikinglycdn.com/files/a2d05c93-1310-4e07-ab85-0a87ceeeb15e/matlab_programming_language_download.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_c24e2d785c2e439f86b4d53dc9074d76.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9030196-7532-4aff-9a46-cf86f4b0b5b6/how_much_horsepower_does_a_jeep_cherokee_srt8_have.pdf
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_1cdc59ace7c145f788dca6d1973419d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1c16f9a-13f4-4099-b1a0-8a5fb15f5063/84919911878.pdf
    • https://uploads.strikinglycdn.com/files/0be781e6-c586-4455-9d21-d3a96c0ca630/start_where_you_are_meera.pdf
    • https://uploads.strikinglycdn.com/files/3b5a7761-8d0c-49e4-adb8-753d907a5230/how_to_change_chart_background_color_in_thinkorswim.pdf
    • https://uploads.strikinglycdn.com/files/630fd593-8469-4653-b4c9-f166958ddf12/msi_z97_gaming_5_code_00.pdf
    • https://uploads.strikinglycdn.com/files/e7c28053-3127-4632-ada6-72b1931d38f4/iphone_5c_price_in_amazon.pdf
    • https://uploads.strikinglycdn.com/files/05eea0cd-407b-4353-a0bd-59ff773c4339/what_is_the_best_home_alarm_system_to_buy.pdf
    • https://uploads.strikinglycdn.com/files/24fa051e-2a52-418d-a1e2-54e694e57dca/14205442678.pdf
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_00a345fa2ea4478b85c045988497db5e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6effb8fc-5c2f-4e11-8ce5-6653692f5a34/how_to_tell_if_my_aquarium_heater_is_working.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_off00010f96.bin
c332ce352d72005be3701967e02fad189251e887e79431b0023ff3ec1c4df128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 5380 bytes
font_01_sfnt_off000121af.bin
b06d00f340f58b865247b08f757eb4aae25c904da5a0e57ed16c97b949d87822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 16092 bytes

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