Malicious PDF — malware analysis report

Static analysis result for SHA-256 50daa418f01bb799…

MALICIOUS

PDF

71.7 KB Created: 2021-03-20 23:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efeee07306d8f0e52f4ed3b833a376c0 SHA-1: ee3506c8a71f61b242421319caffd079c3cb3fb8 SHA-256: 50daa418f01bb79922479c14b13f3e63cd80b4b4eaf8e24263415340a33b48dc
142 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=convert+pdf+to+word+adobe+reader+dc
    • https://cdn.sqhk.co/kefivaxepaj/cptig7l/kevatixomumi.pdf
    • https://cdn.sqhk.co/bajafigotuvi/rthhBha/24175112761.pdf
    • https://cdn-cms.f-static.net/uploads/4487206/normal_6035617f339f6.pdf
    • https://zobupasig.weebly.com/uploads/1/3/1/4/131438120/zoxuma-dukolizowasodof-minowe.pdf
    • http://tademiz.iblogger.org/cardiac_arrhythmia_ecg.pdf
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/81d1b20ce.pdf
    • https://cdn-cms.f-static.net/uploads/4407086/normal_600d2590bf54f.pdf
    • https://cdn-cms.f-static.net/uploads/4447280/normal_6019886dad450.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/22b68eb084.pdf
    • http://inglassrus.ru/midexibepegog0afc1.pdf
    • https://cdn.sqhk.co/zezinojox/jfDxaia/89748024124.pdf
    • https://kukefilatisila.weebly.com/uploads/1/3/4/4/134498126/1829207.pdf
    • http://devgm.design/moxigesokitodutabilobolzo00g.pdf
    • https://cdn.sqhk.co/tivuzofep/fhaKVhe/papusopabuvatitusipajane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tejovixija.rf.gd/72472048220.pdf
    • https://uploads.strikinglycdn.com/files/138513f6-4503-4366-96ef-652753e27332/which_indian_food_has_more_calories.pdf
    • http://pidazedovag.epizy.com/amazon_echo_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/e972b0b9-b6e6-4ae7-9552-a3b165238e5b/88467933052.pdf
    • https://uploads.strikinglycdn.com/files/258f4d9d-5406-4b0b-9f8e-3b430d543aab/star_trek_voyager_cast_season_5_episode_13.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_off0000dd19.bin
d6c999e9d271201ed94549312f327b2adb170e404ad582469e6df7497c5f416f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 5136 bytes
font_01_sfnt_off0000eeb3.bin
a3d46f7bf9348a7823cefdb4dcd5705a42f1ae6c34d9f909287c2dbc1f33e2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10272 bytes

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