Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3ceafd93a563eb…

MALICIOUS

PDF

75.2 KB Created: 2021-03-29 18:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f0e6926d8648234ab8aebb3c5f57971 SHA-1: 86ba538f173f492893dc08dab89a037bba676f08 SHA-256: 5d3ceafd93a563eb322d2f094113c4e603b2a5fd3c1c2b1e4706b37292c8166b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=super+meat+boy+unblocked
    • https://cdn.sqhk.co/duponetix/OCFggif/77828481371.pdf
    • https://cdn.sqhk.co/kogoruzojif/dIAcGjc/gwent_the_witcher_card_game_all_cards.pdf
    • https://cdn.sqhk.co/rijomawonuj/bgjidjb/81040388904.pdf
    • https://cdn.sqhk.co/forexidof/Irud3hb/teguxejonamozaz.pdf
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdf
    • https://cdn.sqhk.co/bepigulusibe/iAItLhb/xavuru.pdf
    • https://cdn.sqhk.co/xisapabo/8TTXiie/adore_slides_crackeado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wolina/ms_flight_simulator_2020_xbox_one_x.pdf
    • https://uploads.strikinglycdn.com/files/de2650b7-560a-4605-93f6-ed97e72a4fac/fubosizato.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_73f75621c13d45ef9d521d6caa550351.pdf?index=true
    • https://s3.amazonaws.com/jedaxopopuko/blender_dope_sheet_empty.pdf
    • https://s3.amazonaws.com/febopa/que_es_la_biblia_catolica_explicacion_para_nios.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/meaning_of_a_classified_balance_sheet.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_fe385cffaa9a40bbbdfb94bb51dd1e56.pdf?index=true
    • https://s3.amazonaws.com/damerirazib/42990971881.pdf
    • https://uploads.strikinglycdn.com/files/51ec28dd-6dbe-4759-a795-facb2a174ac4/87777240695.pdf
    • https://s3.amazonaws.com/forupokisip/laby_elsword_guide.pdf
    • https://s3.amazonaws.com/mejados/34750220918.pdf
    • https://s3.amazonaws.com/ladojenefe/gelunedukikujuf.pdf
    • https://s3.amazonaws.com/vezumobigodub/zofexejamonagigo.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_off0000e7b2.bin
c55d304e704884cd1079c4b46b8c49be87413ea25e7801cea6a7bfba560e6a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 5452 bytes
font_01_sfnt_off0000fa24.bin
c32811a131d6cff9b5805606e41ca2be20cb756dca3bed9fec9836bb0b01161c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 11016 bytes

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