Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56a5eb4879f029f…

MALICIOUS

PDF

74.0 KB Created: 2021-03-15 00:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a437e4c7db0ef8769a006610ee58df6f SHA-1: e0539f9b9af522b83534709f4c5231349eb40f36 SHA-256: b56a5eb4879f029f896ee8a97d9e892bd5ebb47d9685273f00d7e4d39a32c1d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of a specific URL related to 'techno ringtone mp3' further supports a lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/wix?keyword=techno+ringtone+mp3
    • https://cdn.sqhk.co/javomekoru/cyxieif/us_soccer_digital_training_center.pdf
    • https://cdn.sqhk.co/lupobikud/gghfDMD/ripavuxasi.pdf
    • https://cdn.sqhk.co/gofelaxes/hPjchgl/25436696706.pdf
    • https://cdn.sqhk.co/janurisu/PKagdib/retro_games_emulator_online.pdf
    • https://cdn.sqhk.co/niripakexad/bgjYihb/pudding_monster_4-_25_3_stars.pdf
    • https://cdn.sqhk.co/fegujajox/fjggfgi/66464361248.pdf
    • https://cdn.sqhk.co/vudupapuj/YigP9jg/75023601368.pdf
    • https://cdn.sqhk.co/defisepeniba/Qhg46HX/rare_parrot_teacher_definition.pdf
    • https://cdn.sqhk.co/zuvaworizon/gggjEj5/stick_war_legacy_apk_download_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/befafuni/chitralekha_book_free.pdf
    • https://s3.amazonaws.com/fukepez/black_desert_online_musa_character_templates.pdf
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_0738575af1ea4b34b2fe35a60dacdf9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d846de7c-00d3-447f-8a02-d8716d152071/99031318539.pdf
    • https://s3.amazonaws.com/wekibik/nuturogotewage.pdf
    • https://uploads.strikinglycdn.com/files/7777d0c9-e004-4d51-9954-00cc289f7f8d/subtraction_worksheets_for_grade_2_with_borrowing.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_abddee32afca48b98cb466436dbc6c0b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/286f1743-fe70-4217-830d-dfd798e3faeb/16298324333.pdf
    • https://uploads.strikinglycdn.com/files/a3f53e25-d29f-4342-9f03-8a33b7e92988/2124995993.pdf
    • https://uploads.strikinglycdn.com/files/6453c1de-22e3-4363-b599-30ff56f812b0/xalafar.pdf
    • https://s3.amazonaws.com/tevomenil/spiritual_awakening_meditation_guided.pdf
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_fc965ce8f41e4348b57da3354311e327.pdf?index=true
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_cdf97ef11bbf425cbf5a8dfa842f4de6.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_off0000d935.bin
b4b5b289fe618070bff039b4cc882a18f43b44933ca0172ec91a22011aaa3419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 4828 bytes
font_01_sfnt_off0000e96f.bin
8442417a32916613323942edb6eb81ecd099ae81c0567f8c0203b9a4dd7db36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 10272 bytes
font_02_sfnt_off00010c5e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 4324 bytes

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