Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9805245835144e2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-13 23:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6236005a0c34eb511dc15d877b327024 SHA-1: 7b2c8fe84678ae9eb58849285f34a6608ab6ec9a SHA-256: b9805245835144e22cb37a4115c29d43dde9fab86e39601671ccd09f07e03707
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing or malicious document, specifically flagged by ClamAV and an ML classifier. It embeds external links, with one prominent URL leading to a domain associated with malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'Android studio custom project template', likely intended to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=android+studio+custom+project+template
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fdc08eb510af.pdf
    • https://cdn-cms.f-static.net/uploads/4381543/normal_602b063b72d8e.pdf
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fc9dde87536f.pdf
    • https://cdn.sqhk.co/kipaselofuza/hhewmLO/gifibimupo.pdf
    • https://cdn-cms.f-static.net/uploads/4450634/normal_602ceb2b7283b.pdf
    • https://cdn.sqhk.co/tumitibira/8jcNiff/action_day_planner_2020-_21.pdf
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5fd7a8653c8d0.pdf
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fc9c31a30df6.pdf
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5fcb6619ae596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7820895fadce44f9b107b2abe2dd0089.pdf?index=true
    • https://s3.amazonaws.com/jupoti/budget_template_in_excel_for_home.pdf
    • https://s3.amazonaws.com/pojikovewijeja/9673169401.pdf
    • https://s3.amazonaws.com/tobobowu/lod_and_loq_calculation_ich_guidelines.pdf
    • https://s3.amazonaws.com/wujixus/kindle_keyboard_update_3.4.2_download.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_ff15478edfe94a518a3571bb356603f3.pdf?index=true
    • https://s3.amazonaws.com/zowejunef/game_hungry_dragon_apkpure.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/vertical_jump_program.pdf
    • https://s3.amazonaws.com/xelimewat/tanzania_movies_kanumba.pdf
    • https://s3.amazonaws.com/zesotat/gawudo.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_70063fedfd9249d19f1d7eb0a555cd72.pdf?index=true
    • 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_off0000eb60.bin
a0b93bc27208c48798532fecb7904cd4b65dbd82d3efadc660e5611a2a2ffbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5284 bytes
font_01_sfnt_off0000fd46.bin
9036891dfe69594b8d8c4e654a2a0d28039bbbf634d20b09f84c66955b28fbd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10740 bytes

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