Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3c51e331312afc…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 13:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6385734730e715869102145c0f91257 SHA-1: 7c3ed747e40a6f7ae2df4a2a336820e4284fe0b6 SHA-256: de3c51e331312afc1782b97928058cdd1cd716955c6ffb93676f91bd66b2cc69
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://druttle.ru/wix?keyword=regents+biology+summary+questions+answer+key', suggest a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://druttle.ru/wix?keyword=regents+biology+summary+questions+answer+key
    • http://abwaab.su/action_adventure_game_for_android72p4l.pdf
    • https://cdn-cms.f-static.net/uploads/4409000/normal_60381f28acc53.pdf
    • http://viewcreditscore.info/brookstone_big_blue_power_speaker_manualb16h6.pdf
    • https://cdn.sqhk.co/jevikepuja/ijbidjd/82199337772.pdf
    • http://toreret.scienceontheweb.net/vivaldi_beatus_vir_rv_597.pdf
    • http://all-gopro.com/plot_diagram_examplec0nxm.pdf
    • http://gisoboxizaza.mygamesonline.org/linajuxofexufavokuvej.pdf
    • http://fasoxuxesatilu.sportsontheweb.net/bigovexatajewixosupese.pdf
    • https://cdn-cms.f-static.net/uploads/4529095/normal_6062cb1396887.pdf
    • http://carishr.com/artillery_calculator_squadvpzhu.pdf
    • https://cdn.sqhk.co/laratakidev/ujjfjgS/53909443368.pdf
    • http://vashobereg.com/787867282342hzty.pdf
    • https://cdn.sqhk.co/mokevesin/znoibF2/fobetufusisukizuvasijoxop.pdf
    • https://cdn-cms.f-static.net/uploads/4374373/normal_600d6a851d402.pdf
    • http://nifimoperokoj.medianewsonline.com/formula_para_sacar_el_volumen_de_los_prismas.pdf
    • https://cdn.sqhk.co/xonipavu/eijchbl/word_finder_app_android.pdf
    • https://cdn.sqhk.co/nanubebebot/8zKDjgV/basketball_battle_apk_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/80151fcd-6388-4ec5-b4ad-7092ac18d904/19110634408.pdf
    • https://uploads.strikinglycdn.com/files/b78ab5cc-f79c-4ac1-ab00-1903aa027378/commodore_64_original_price.pdf
    • https://uploads.strikinglycdn.com/files/45731097-5103-4306-93b7-e75875bcd74d/toxig.pdf
    • https://uploads.strikinglycdn.com/files/44e0d2e9-afd2-42a5-be9a-b01f7e12cfbd/honda_150_hp_outboard_service_kit.pdf
    • https://uploads.strikinglycdn.com/files/d0ac897a-ca72-4ce3-81a0-4a4420e80467/what_is_the_meaning_of_metaphorical.pdf
    • http://wovuluvoju.onlinewebshop.net/webarchive_to_converter_online.pdf
    • http://jifimurosesapu.atwebpages.com/pengertian_asidi_alkalimetri.pdf
    • http://nijarigu.onlinewebshop.net/cardiology_cheat_sheet.pdf
    • http://baxewape.myartsonline.com/angielski_w_tumaczeniach_sownictwo.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_off0000eb9c.bin
d92ca8e709aa886921c625f28712fa4cd643ada6886b1e8119443b7e85ec56c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5536 bytes
font_01_sfnt_off0000fe7a.bin
98301c36146fd270f47aa3a6dda250c096f47f02b9b066e7482bb4b095b7c73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 10924 bytes

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