Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2c71111b8f6d66…

MALICIOUS

PDF

81.5 KB Created: 2021-03-27 11:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e220dc5cda38fd1c8675b5f6ee662b5 SHA-1: 9cf8de4fd8f3eb45b93c33fc67c0f1bf8cdb1014 SHA-256: dc2c71111b8f6d6639fe4596c3d8f74edfa1bb4b90cbeb8649eabcc9f1de8d01
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=finding+asymptotes+of+rational+functions+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4451221/normal_5fd998ddf118d.pdf
    • https://static.s123-cdn-static.com/uploads/4496815/normal_5fce8aec1d020.pdf
    • https://cdn.sqhk.co/puvubuzu/cJUJFgf/woot_deals_and_shenanigans.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fe741c81155c.pdf
    • https://cdn.sqhk.co/wanaxowuwot/chjQjCL/verivatesozimaxevidit.pdf
    • http://sport-stavki.fun/destruction_derby_2_gamefaqsmz6vc.pdf
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/785780.pdf
    • https://cdn.sqhk.co/nilimijano/XRwieWY/nedojobosewod.pdf
    • https://cdn.sqhk.co/rebibenizuj/giicger/vizokuzewulegib.pdf
    • http://buyfastedcircle.xyz/23730514649wde8p.pdf
    • http://maslovauto.ru/one_night_at_flumptys_2_downloaduqguc.pdf
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5ff980f443300.pdf
    • https://cdn.sqhk.co/xivovido/j7hemia/26004279768.pdf
    • http://lishop.site/genetic_testing_pptshmtf.pdf
    • https://cdn.sqhk.co/vojofarakiva/jjjfieV/69898506867.pdf
    • http://khanapoorti.com/adjusting_entries_are_recordedvg9dj.pdf
    • https://rufekelikofevav.weebly.com/uploads/1/3/1/0/131070689/543871.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_8beea258d58d44719193c15e875dd4e9.pdf?index=true
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_002af1bbfda84452bc76b5fc8e2d431c.pdf?index=true
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_6c7faf05056643b08d7f83f9ba342371.pdf?index=true
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_b0a3639ca5fb435296408110558b51f7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f153.bin
012c57822afc8845fa6f6a6f442155a148a03baadd4d59f2ce6f3a8520c88647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5664 bytes
font_01_sfnt_off00010486.bin
42de7efa14893dc15ab9630656ffed1f880a746bf58456629783a0517aa5e6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10892 bytes
font_02_sfnt_off000129ea.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 4324 bytes

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