Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f0a05ce7c2d938…

MALICIOUS

PDF

82.1 KB Created: 2021-03-11 13:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e8d86e40214fcb3fa6c464ad2b46edd SHA-1: 8059528087e0c1b09f511bafc879923e7dc93f1f SHA-256: f6f0a05ce7c2d93854639aa1b8723485da85c89af35a34307f1633a0a8349fc5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a mass external PDF link farm and ClamAV detection as a phishing trojan. The ML classifier also returned a high probability of maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'castration anxiety pdf' and contains numerous embedded URLs, many of which are unknown or potentially malicious, indicating a phishing or SEO spam campaign.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=castration+anxiety+pdf
    • https://cdn.sqhk.co/fufigavaki/icxKieC/super_pixel_heroes_android_1.pdf
    • http://rte-ita.fun/21250904858q7phd.pdf
    • http://vusejulene.iblogger.org/free_wifi_calling_app_for_android_phones.pdf
    • http://soribowunalosu.22web.org/71215143935.pdf
    • http://hookup756.fun/912127458815uv2p.pdf
    • http://discovljzg.fun/poulan_p3416_carburetor_adjustment_toolaqze7.pdf
    • http://hookup673.site/proving_triangles_congruent_asa_aas_sas_sss_worksheet_answers1olic.pdf
    • https://cdn.sqhk.co/naliwanik/iZx1jeb/samsung_level_u_wireless_headphones_charging_time.pdf
    • https://cdn.sqhk.co/jobasalem/6gejigh/fastest_launcher_apps_for_android.pdf
    • http://babomuniv.22web.org/hatha_yoga_benefits.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/73923d58-9ac7-47e4-8297-4acbb4ff2a1c/how_to_handle_conflict_resolution_in_the_workplace.pdf
    • http://narumigopu.epizy.com/setting_time_on_citizen_skyhawk.pdf
    • https://uploads.strikinglycdn.com/files/8d0778b5-2102-4e5d-9f2d-9c787d0932d5/gugowepuzav.pdf
    • https://uploads.strikinglycdn.com/files/569fe125-5f65-4064-833a-d0fc7a47710b/bowflex_xtl_power_pro_parts.pdf
    • https://uploads.strikinglycdn.com/files/bf9a300b-75c9-4b56-a8b3-36897d5e8ae6/67701143585.pdf
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_eff7e76ab5694d2b83e6ba33e0652f3d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fdfc330f-bb94-4f02-b18d-70804eeb55e8/defugugosikadumubugiziv.pdf
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_4d2bfbd479034a42adbf3f416c1a44bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6832e400-84c4-4565-a579-55b385da18cf/taco_bell_chicken_power_menu_bowl_calories.pdf
    • https://uploads.strikinglycdn.com/files/a3e2b55f-ce90-467e-937e-eccc59a7d0a2/dmc_embroidery_floss_color_chart_printable.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_bee9a8ffb7554f59bf92115f86706a15.pdf?index=true
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_6f29ff95bd0b468282b7fb66cc3f01c8.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_off0000f7b4.bin
9414d6964e49beea3436d14d80424ebac540f02f372dbb2c46a6cd150bb1c0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 4984 bytes
font_01_sfnt_off000108bf.bin
12befcee0ee5fef290f045441c3f0dde3db87eca0447dd1ee016158a6c077071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 10584 bytes
font_02_sfnt_off00012cb7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 4324 bytes

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