Malicious PDF — malware analysis report

Static analysis result for SHA-256 d943f4b3faa19a33…

MALICIOUS

PDF

79.8 KB Created: 2021-03-18 00:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 91acb29c9b117534a4f0be8378c5ed22 SHA-1: 94a9daac358742321ac329b88ba1889fa87de6a3 SHA-256: d943f4b3faa19a33e7c093076b5d790462912bd031e7b3f58373a06148be57d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute malware. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', suggesting a malicious intent to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/wix?keyword=thunder+tv+apk+mod PDF link annotation
    • http://sunakijabe.sportsontheweb.net/bach_cello_suite_1_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/cgjFRhi/i_wish_your_happiness.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/ggq5Ghf/hero_xpulse_200_price_in_kerala.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/z9haChd/bixupekavuboloropobuxar.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/g4XNImg/biwexuxijifuponipimoto.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/FJI1ijh/93010526768.pdfIn PDF document text
    • https://cdn.sqhk.co/bulamije/uXgnvii/cold_war_open_beta_date_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/jigi6hd/billie_eilish_my_future_live.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/ibjdJl2/the_last_stand_union_city_full_walkthrough.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/how_to_change_the_code_on_a_schlage_keypad_door_lock.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/mechanisms_of_evolution_worksheet_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0e0796-d6d1-49e4-9367-9d58fdf3c9c1/how_to_reset_viper_auto_start.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/how_to_install_wireless-n_wifi_repeater_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/triangle_midsegment_theorem_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/96095496649.pdfIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_467a388c9d854cd18a3fd1c8058a0877.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_b5f3e566066842a785767d5b6ca38ddd.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_6670a6209b6b482a986a32f8487f6f38.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_01e24b1ee50c4f088b269cbe3856376d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bea646-7fde-46f7-8f16-712d95bf41bf/psychology_in_modules_12th_edition_by_david_g._myers_c._nathan_dewall.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_6deb7fe46dfc49ebb211abb035dc0b87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7dda04-f0cd-47b2-8f45-f780f9bbf0fb/27897458070.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 5064 bytes
SHA-256: d68df58beb11a1ddbf33cc9dedb5b810bbe0b59aaeb06b8ff9c0ca0a9a221f69
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 11164 bytes
SHA-256: 0d543fb873acbe20117f9203b36a47dc1a65642464e96b79ed7f5fff2d3a3be1