Malicious PDF — malware analysis report

Static analysis result for SHA-256 745fa5b1d34de204…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 00:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1c95c7c98a5534f8209c2a769308fd3d SHA-1: 72032a86096105afc16aef62c4a2b1ba3dc7b6aa SHA-256: 745fa5b1d34de2045558e0883757d1cfc17381dd6a5b452c9a28342062d978f6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/aws?utm_term=maxi+cosi+mico+ap+user+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5ff664c8a0253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_6049dbdeb0526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_11e7e62bdc4341d8a7da1cef0cb4907a.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_7c1b8161bc46464e84e500259ecede4a.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_4e657b699c2049d996b9793e3495367e.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_3eac7108723e4971a2eb62f2cb0935f3.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_1b2aa2ec695c48fd99b7f7188ae2f48e.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_70b6ec5e3fe042bea8fbb640fc779366.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/xubevakisexof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365d2f54-c5c9-44be-a308-882794f0a923/principles_of_foundation_engineering_7th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1198086f-81b8-470f-96c8-5861f690ac1d/70171392191.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_4cc976127bef436bb5eece0bbfcebcf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6ee634-e9d1-4bb3-b94c-2847691f1d18/66442987631.pdfIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_90d263bdd0bb49628309c6fb0621144c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/714268f2-d463-49fe-9c96-50f8ec46d7db/wusabi.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_027d8a9fbcc24789bd23c2d096711e11.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_d94cc8b167c24ee584455f9cdf706113.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/60383516082.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_5760d65fa1bb44c387bcef34a8b1278c.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_39098eacffc14583a3311b12ad7c8c93.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5132 bytes
SHA-256: 9a7ac5215512f9009c76d281f466c2544cd59682910811623a4fae8ef3188ce9
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 12292 bytes
SHA-256: fccc42d951ddf654c76e8b3d9cc194f998f298bbe1c94e13d1bee97206e45473
font_02_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71