Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4c19e1e805dd8c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-12 07:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62422f05edd6bef1327f1627913403c8 SHA-1: e637b4c5e4e48f1aeff126d6ae206516b1745483 SHA-256: df4c19e1e805dd8c3595b7cb9c695e398a64a6e88c624d33f66037c00a3fb22c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to external content, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/award?keyword=thanthi+today+news+paper+in+tamil+pdf+download
    • https://cdn-cms.f-static.net/uploads/4445334/normal_6036b60fb9023.pdf
    • https://cdn.sqhk.co/tiwumixe/ftWSghd/wakexegobiv.pdf
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/3571449.pdf
    • https://cdn.sqhk.co/rojarimeg/hgtwHI0/bike_racing_3d_bike_race_free_games_video.pdf
    • https://cdn.sqhk.co/wofutajo/Zheknii/konami_football_games_for_android_2012.pdf
    • http://rowomonug.mywebcommunity.org/learn_english_through_story_advanced_level_6.pdf
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5ff65bd1a98bf.pdf
    • https://cdn.sqhk.co/xelajura/dibjf7p/create_empty_list_in_java_8.pdf
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fec2ef784eb5.pdf
    • https://cdn.sqhk.co/zikegasenar/ijgfbNo/shelter_island_restaurants_open_for_lunch.pdf
    • https://cdn-cms.f-static.net/uploads/4498868/normal_6026fb8f5a462.pdf
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/vasolotulum.pdf
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5ff0b6ac18694.pdf
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/saxejovuwefedo-xulijote-lejisemuxi-ragosewekezule.pdf
    • https://cdn-cms.f-static.net/uploads/4424405/normal_603b7a8d7f376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://supuwevul.atwebpages.com/the_crown_season_3_cast_queen_elizabeth.pdf
    • http://zerowegujij.onlinewebshop.net/how_to_bake_cake_in_panasonic_microwave.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_d49f6b0c09e442ab84b030a2976296cf.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_6631da68a1124ca1be23d8e023e4c4c1.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_4aa646321e054f8fbc8e0a041f6422e9.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_85aec559610847a1901f8aa5969b3ba2.pdf?index=true
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_dea96fe8a013435ea2bd156ce92269f8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f003.bin
17c673c9f711eeed577eed43e603ea2d5d78fbe625db2fa07b07a0f24e5d241a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 5424 bytes
font_01_sfnt_off00010261.bin
983e6e009f310dfdf9159148c33360d772fb52502ba0a4c39ef599c3b723bf0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 3644 bytes
font_02_sfnt_off0001105f.bin
f2506f6f812da923cdbdaea9a64578f8553aa7086b195ff5acd8aeb8daf08934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 10520 bytes

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