Malicious PDF — malware analysis report

Static analysis result for SHA-256 671fabe5453ed673…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 20:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f43cb900cc4cc7259fa7ee573efcbdc5 SHA-1: 90e23ce2617a5c7044ccac950f9e1ab7d302c1f1 SHA-256: 671fabe5453ed673cc0900b4e19076ebb23b2e38ce88bbc2c03d8743c0255eb9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://crophysi.ru/award?keyword=number+line+graph+pdf'. This URL is presented to the user as a 'number line graph pdf', indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/award?keyword=number+line+graph+pdf In PDF document text
    • https://cdn.sqhk.co/sidogorego/jgjgRid/events_this_weekend_in_downtown_atlanta.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/72562616259.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/f4ihjLj/trick_shot_shooting_games.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/BgjGDe2/bizaxagapojezetud.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/5jhWheP/19666110417.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/is_wendy_healthy.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/ghcJjaX/97308505961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce494635-837a-491b-a439-f0431673118f/graco_nautilus_65_3-in-1_booster_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c63e0d-ebcb-4012-a658-38dfa72c3c55/55179039913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef50f917-aa83-4a02-9803-f048db51be2c/zunamunapikelakuxebopezur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6223935e-0288-4598-a48f-5235a7da80d3/keystone_pipeline_map_kansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bfc6f0-3387-48d3-8ac2-59ff79df0457/lapadibowuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1775118e-0f06-46ac-9be5-8dddec77556b/24550374243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdcd47d-e0c4-421a-8282-6fea6c935c0d/bounty_hunter_lone_star_pro_metal_detector_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f5c3ee-9093-4076-915d-3e91be29178b/dominos_pizza_australia_investor_relations.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/what_to_do_to_stay_safe_from_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd23316b-eb4d-41b8-be7d-f6a2e09807ed/how_do_i_change_the_ink_in_my_canon_mx922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f04b70-fb4d-437c-9062-8b8cd2fb78ad/matani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2955bf-b019-400e-857f-8a7242706696/what_difference_between_bacteria_and_viruses_shows_that_bacteria_are_living_organisms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4eaa4c1-becf-4cdc-9a15-999e36421f96/trade_in_amazon_fire_stick_gamestop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8c0e72-7c0f-462a-9075-5d741579e3fe/xutototukakuna.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5388 bytes
SHA-256: 3aab66fd8a3d133807a199c83530278ae272acfdd3fd8e501d073667d3bb795c
font_01_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10464 bytes
SHA-256: f12f8ee6cb9ad99d0e02a8c5031cf4b4c074c2b04b39bdc485ac07dbff66da80

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