Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68ed171467c7df3…

MALICIOUS

PDF

130.1 KB Created: 2021-05-31 00:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ef531cc8a05aac1452129d3e68eda23 SHA-1: 8395af29c3c380f0c2e35cece61a1ae312b06928 SHA-256: c68ed171467c7df3f947fddd68e3dcf450c9f86041645ea4c1c2a7c0ea679203
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=antiarrhythmic+medications+pdf
    • https://cdn-cms.f-static.net/uploads/4458144/normal_5fd8d9f57a7b9.pdf
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5ff191de0f03b.pdf
    • https://cdn-cms.f-static.net/uploads/4490141/normal_60681bfa1a58d.pdf
    • https://peguwuxawotenu.weebly.com/uploads/1/3/4/5/134582441/2fc81.pdf
    • https://sixabizutobago.weebly.com/uploads/1/3/4/6/134613494/tavarelirodu.pdf
    • https://mapimodedafibo.weebly.com/uploads/1/3/4/7/134708703/xuletegalodeg.pdf
    • https://cdn-cms.f-static.net/uploads/4485322/normal_601973f4a228a.pdf
    • https://xovatofenutadom.weebly.com/uploads/1/3/4/5/134511467/0de57cd74d.pdf
    • https://wovusowi.weebly.com/uploads/1/3/4/8/134886666/feganuraxubirebix.pdf
    • https://cdn-cms.f-static.net/uploads/4485570/normal_6023eae4dffdd.pdf
    • https://xozagalan.weebly.com/uploads/1/3/4/5/134519104/petivewa_wilimaki.pdf
    • https://bifezogutagu.weebly.com/uploads/1/3/4/5/134598372/sopumerogotem_miraz_zewudubemibuje.pdf
    • https://cdn-cms.f-static.net/uploads/4458824/normal_605519368b8b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d9359941-06b0-4843-a154-6ce9b941eae1/10483965430.pdf
    • https://uploads.strikinglycdn.com/files/51ff752f-5742-44f3-8e2d-fad1f0d33660/marlin_model_60_performance_parts.pdf
    • https://uploads.strikinglycdn.com/files/27bfe866-598d-4cf4-aa32-8f9a1277deec/traduccin_espaol_frances_google.pdf
    • https://uploads.strikinglycdn.com/files/0c921221-6efd-42c2-abea-c417fc0066f0/how_to_descale_nespresso_delonghi_lattissima_touch.pdf
    • https://uploads.strikinglycdn.com/files/c837c8f2-5343-4c53-b722-d0ad886e1851/c1_c2_english_vocabulary_list.pdf
    • https://uploads.strikinglycdn.com/files/233a72c2-ccdc-439d-941e-a31e00ee4ebb/palowapixeganawisidaj.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c45.bin
18a8adde81ee4959be63c7160eeadaaabc6f9fbf55e132b16bc379375b02c6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C45 5244 bytes
font_01_sfnt_off0001ade2.bin
6481ce3cdf617f355a14d22e7e9ba294d1323aa6992ba1640d838625d463836b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADE2 12004 bytes
font_02_sfnt_off0001d729.bin
8be69302d4e45fe85c9fab78dc6d96cf410d6213fddef079043d254261a79733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D729 16176 bytes
font_03_sfnt_off0001ec49.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC49 4324 bytes

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