Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8275d26cb245416…

MALICIOUS

PDF

74.6 KB Created: 2021-03-11 14:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 990e9ca0b71e6982fc641b3788b639f1 SHA-1: fa876bcd1f4662d7c6e64c6fd2cb4c2ca3ad37da SHA-256: d8275d26cb245416930b575f5762b6318c14c05177b09322dccb6a758bd681f9
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious intent by using numerous links and keywords to appear legitimate. No scripts were extracted from this sample, but the overall structure and URL analysis strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=social+studies+chapter+7+study+guide+answers PDF link annotation
    • https://cdn.sqhk.co/duvapegoleva/hJrjijj/bricks_breaker_swipe_balls_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/zutomina/jcjhbIM/arctic_wolf_287bh_sr-_1.pdfIn PDF document text
    • http://soldonlakewood.com/lirimawazotexadonaxiputq1pbl.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/00Dgjgg/tezinoxusepe.pdfIn PDF document text
    • http://reassurez-moi-fr.info/90282988097gzbqr.pdfIn PDF document text
    • http://oneshops.space/azar_app_hack_apkamlt9.pdfIn PDF document text
    • http://nibelv.xyz/dungeon_of_doom_buried_alive8nd9m.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/jCgcVPH/avengers_beta_xbox_gameplay.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/berserk_volume_39nymi8.pdfIn PDF document text
    • http://premial.su/what_is_better_green_dot_or_red_dotjlyx9.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/iaiaSif/98541703858.pdfIn PDF document text
    • http://salonly.xyz/21164573273pn7g2.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/ponniyin_selvan_book_in_englishm7iob.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/9d382d6a-1e2e-40f4-bc2b-5b7b4eccbee4/romeo_and_juliet_act_4_scene_5_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de39596-4ee8-4c48-9b41-4a5fda6d4cd9/fokaremuzekesafedaranuvej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25366191-58b2-4d99-b751-cdfbdfa640ee/93916668809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9218cdbb-88ff-4788-9b63-61dc224960fe/bifapanarujuxapax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68428825-a61b-41d3-b128-2fd7c108cc6f/love_simon_book_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f4a9e2-322f-4c90-b3c8-7b139b03166a/what_other_jobs_can_a_project_manager_do.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_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 5712 bytes
SHA-256: e4b18fcd6e407a8faf0fad57f9e5cec5532587ee9d48b207c4c9c65f2cb0654a
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10492 bytes
SHA-256: 8494759609898b1d15ccb6df3dd29cf6252eed00d8fe9d2e4fcfece8c4c5c69d

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