Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a83725fcad3bae8…

MALICIOUS

PDF

101.3 KB Created: 2021-03-25 15:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bffe385bd0719aec35a65d1050bd68c6 SHA-1: 34ba90510bd3b9bf94ad1fb272d2b13903fe48b1 SHA-256: 3a83725fcad3bae85f8b4c5aeb261440fac6c83af599b6233aa6a9864577b768
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/award?keyword=define+behavioral+theory+pdf
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/c4a9c366.pdf
    • http://matteset-spon.space/are_smart_cars_cheap_to_maintainqlhv7.pdf
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/faxiwu.pdf
    • https://cdn.sqhk.co/lopijikuvi/bqJdfia/super_oscars_menu.pdf
    • http://sopugepibimel.mypressonline.com/calisthenicmovement_mobility_program.pdf
    • http://padojobimo.mywebcommunity.org/76118702765.pdf
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/napojizazat.pdf
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/cfd82663.pdf
    • http://astrology-personal.online/black_and_decker_mini_fridge_temperature_settings4a275.pdf
    • https://cdn.sqhk.co/jakufomego/8KXrjgf/desktop_screen_video_capture_free.pdf
    • https://cdn.sqhk.co/bowevuva/YiiKNcs/pokejazukilujavovedabig.pdf
    • http://mihetos.xyz/mopefatajonuvubugitadl9boq.pdf
    • https://cdn.sqhk.co/reposivekow/hbjfjdh/45380400350.pdf
    • http://marketeuro.pro/how_to_use_autel_obd2_scannermd7zi.pdf
    • http://in-step.shop/farewuw0vobi.pdf
    • http://taforojujutusig.mygamesonline.org/97525086273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a71904d5-39c6-4849-8d18-4b7d57d727c1/is_crossfit_level_1_test_hard.pdf
    • https://s3.amazonaws.com/liwafo/cuanto_cloro_granulado_por_litro_de_agua_para_piscina.pdf
    • http://letutemoxeluz.onlinewebshop.net/not_everyones_cup_of_tea_meaning.pdf
    • https://s3.amazonaws.com/bomifabipi/android_emulator_screenshot_location.pdf
    • https://uploads.strikinglycdn.com/files/acb0ee27-43b0-499e-8f0c-900d1e851bc8/what_alice_forgot_movie_julianne_moore.pdf
    • https://uploads.strikinglycdn.com/files/21e0eae5-5d1e-45ef-b897-53292d6a9ffe/puzenebujowaxum.pdf
    • https://uploads.strikinglycdn.com/files/34a48570-f473-4287-99c6-302704a0d7a8/does_wild_tiger_lose_his_powers.pdf
    • https://s3.amazonaws.com/luborinizu/herman_miller_aeron_chair_refurbished_uk.pdf
    • https://uploads.strikinglycdn.com/files/fa5545bb-9b24-4828-ac75-cb91f31f89ed/750609498.pdf
    • https://s3.amazonaws.com/zulezov/how_do_i_reset_my_parrot_ck3100.pdf
    • http://wenibeliso.atwebpages.com/dugegabujikedi.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_off00014d85.bin
88d785fc0d114d92922d4eff9d4674708e68dd0565ef87e669d7f2e917f99aeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D85 5252 bytes
font_01_sfnt_off00015f69.bin
e0c185c654ac74e2c54db397566c54ce6902e5facf69ae755de0ca942b307c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F69 11728 bytes

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