Malicious PDF — malware analysis report

Static analysis result for SHA-256 4185fc9d415f4e8d…

MALICIOUS

PDF

68.1 KB Created: 2021-03-29 12:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16da60d8a81352136d25c8d6f4ff4595 SHA-1: bd647e310e1f31763c25fb434b713beac7735dd3 SHA-256: 4185fc9d415f4e8d212955ad92fa06d130efe1d1efea831c07b9fc75a4c7302d
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a URL that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9055

Heuristics 4

  • 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
  • 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=america+west+side+story+piano+pdf
    • https://kuwesitupimanu.weebly.com/uploads/1/3/4/0/134095951/dizemirubawa.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_605ad9c08a66c.pdf
    • http://apkweb.net/instagram_auto_liker_bot_apkh4vft.pdf
    • http://repair-planshetov.ru/893106519291lzom.pdf
    • http://misiliv.66ghz.com/62776699518.pdf
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/vufexejejikagi-zepofela-lesetad.pdf
    • https://gokipojunarofaj.weebly.com/uploads/1/3/4/6/134635425/1314526.pdf
    • https://cdn-cms.f-static.net/uploads/4489834/normal_603c5a63b20f7.pdf
    • https://cdn-cms.f-static.net/uploads/4393900/normal_600fc1ed71314.pdf
    • https://moxofeloxivaxig.weebly.com/uploads/1/3/4/4/134438573/9674848.pdf
    • http://kekemubitaf.iblogger.org/wulorelumigutugopi.pdf
    • http://geosen.net/137949189494og5s.pdf
    • http://ctuxuu.com/dodge_caliber_service_manual_downloa7x8sj.pdf
    • http://muslims.net/gba_emulator_cheats_pokemon_goldx2xdm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_f1b9d47dc93549cda39cd3ed659d9956.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_638e87f5bc9d48c8a70dba3d3f14c323.pdf?index=true
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_eb528d5186ce47d0aca2b9a5465d726e.pdf?index=true
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_10c611a505ea413f9d99fa92d6d54d29.pdf?index=true
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_ce5a5e4a78914462943d1fde46754de0.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee3.bin
1ba01cc0f8b93634ac9c188187a37e0510b743a818f73ad02d74a5d50b91079f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 5452 bytes

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