Malicious PDF — malware analysis report

Static analysis result for SHA-256 5726df53f4e480c2…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 16:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 98a16698d71fe56a426324d55af085e6 SHA-1: ed9c46088f1394243035011ec8d5aac02c34668e SHA-256: 5726df53f4e480c229c601571cfe5962ff528c695ae54e57ac5139c0768ccad2
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 ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'brother in arms mod game free', suggesting a lure. The presence of numerous external links, one of which points to a suspicious domain (golowaki.ru), indicates a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/123?utm_term=brother+in+arms+mod+game+free PDF link annotation
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/579f6e8.pdfIn PDF document text
    • https://cdn.sqhk.co/mulepava/ibiiLih/barron_s_ap_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/hbhbhnV/mutaburufim.pdfIn PDF document text
    • https://ponorevex.weebly.com/uploads/1/3/1/3/131398269/700134f.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/ghijcie/sticky_sticky_bubble_gum_dr._jean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47241883-5110-4155-a33e-d12751bac1b1/nj_transit_fare_enforcement_officer.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/reject_proposal_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/25377002995.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/wazovarixakewinevawixa.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_02f253a0a3c94132b71cd4661e6684ae.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_f8416b30421d4b558c108ba71b06c1ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/barcode_scanner_google_sheets.pdfIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_6efd1c7add684224b7da9011fa763486.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagev/78898427156.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/54414184031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0521e443-9855-4994-b538-cc835446d87c/western_digital_tv_live_media_player_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ece824-38d5-49d1-86bd-fba564e21748/fingerprints_of_the_gods_the_quest_continues.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 5340 bytes
SHA-256: c547a886bf3c3be9ad1933cc563a2e95d0cd956f28f6fec6faa563b70aeac578
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 11280 bytes
SHA-256: 7c8f59e15cd9339be8fbb753e63b294b746a2e68997fae68eedc34efd11a8d64

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