Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc25edd57f4d7448…

MALICIOUS

PDF

100.1 KB Created: 2021-03-11 17:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b9e41fcd134c022f846f49bdd641647 SHA-1: bd22d6785e3c62c202d3fdfda850ea4df0bbe368 SHA-256: bc25edd57f4d74481bd466d04b30221df97bda8bdd54cd9d5f87c636244d3c0b
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "PDF_SEO_LINK_FARM" suggesting a large number of links are present. The document body, though heavily obfuscated, contains keywords related to definitions and PDFs, aligning with the lure of providing a document. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://xezojetit.ru/award?keyword=definition+of+classroom+management+pdf
    • https://cdn.sqhk.co/jarebomu/icgjohj/can_you_buy_california_lottery_scratchers_online.pdf
    • http://zupedaganivo.66ghz.com/how_to_refill_a_primo_water_dispenser.pdf
    • https://cdn.sqhk.co/xamitarerivu/Hhaq9av/tikuwolujufukobo.pdf
    • https://cdn.sqhk.co/gizoxemovefi/ofBhiEr/niperonuvatu.pdf
    • http://nusamovepi.22web.org/galvanized_sheet_metal_roof.pdf
    • http://zowisofefo.iblogger.org/c._t._o_full_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waxegatulo/browserling_com_whatsapp_open.pdf
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_a9ce6838df6444caa526b99766f320fe.pdf?index=true
    • https://s3.amazonaws.com/julaxel/scientific_article_abstract_format.pdf
    • https://s3.amazonaws.com/pasawe/instruction_manual_for_ielts_listening_answers.pdf
    • http://patesosiw.epizy.com/smartsheet_employee_reviews.pdf
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_e33c6b0392c0444ca031cb5f00388959.pdf?index=true
    • https://s3.amazonaws.com/wovugi/saselulo.pdf
    • https://s3.amazonaws.com/rejiner/bushey_academy_uniform.pdf
    • https://s3.amazonaws.com/bepukuba/novutugunusojebavojuko.pdf
    • https://s3.amazonaws.com/vazisi/16192373025.pdf
    • https://s3.amazonaws.com/pafexegud/windows_usb_boot_software_free.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_off00014b9a.bin
0d4336a3ff52ff1efb647ef3c695e295c8a630f5cce8fb347334e05d9edd22f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9A 5476 bytes
font_01_sfnt_off00015e2b.bin
d2d4c56c1eff6b1158e3701fd9cc7b86f3bb4bf1913b2311e8c4fc59dbd06535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2B 10716 bytes

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