Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed2d5f2398636b…

MALICIOUS

PDF

83.8 KB Created: 2021-03-17 22:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90bb004ef4030d3000bdaa9e3d9b1274 SHA-1: dc44a7c31357ad4351e49d6ee6a902512e85add1 SHA-256: 82ed2d5f2398636b79883613f7d989bd73914fbede091895ccf967af351fd845
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to mimic search results. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=adrenalina+racemica+mecanismo+de+accion+pdf
    • http://mists.space/86693081008u5o0e.pdf
    • http://meetplafond.xyz/wogima79ext.pdf
    • http://uabiomanix.xyz/lumubefkyszv.pdf
    • http://sosyaltakipcipanelin.com/acer_chromebook_15_chargerjpdky.pdf
    • https://padukasafif.weebly.com/uploads/1/3/4/4/134404544/jiridite_nubefidafede_bexonusiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_3ea929f0292040589443917bdeeb7b42.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38464692-d2ef-4a0b-94a0-224f917c8dff/58367723380.pdf
    • https://uploads.strikinglycdn.com/files/acfe9924-9104-4f2f-8a52-94e16ed24dab/bohemian_rhapsody_easy_piano_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/2f6fdbf7-f18f-4903-bc9b-9cac49d8a520/28476425190.pdf
    • https://uploads.strikinglycdn.com/files/eb4e7ef3-964b-49a1-8bb8-9211af86ba16/68700326205.pdf
    • https://uploads.strikinglycdn.com/files/ac353f24-300c-41ad-8189-acb9e9057cfb/stranger_things_series_3_age_rating.pdf
    • https://uploads.strikinglycdn.com/files/a6d7de98-aaf8-46d1-a8db-8f5df563fb49/50577238620.pdf
    • https://uploads.strikinglycdn.com/files/9333aab7-070b-45ea-a9e3-cfdff604802a/luduxiki.pdf
    • https://uploads.strikinglycdn.com/files/9db62648-d728-4dca-ac72-bf3b0506d36f/newodab.pdf
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_57655016caf44386886e6e9038374d90.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b8.bin
6d81415852e109fdaf78a8ba0a114ffae317256438eae0fb4e2d8722202bfb8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 5288 bytes
font_01_sfnt_off0001189b.bin
06b251bed953523807c12f7dc9fc5142c07a82a65f15d63f4d4e5861fcabda2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 12356 bytes

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