Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bde718ed0d4bbd9…

MALICIOUS

PDF

66.7 KB Created: 2020-12-21 23:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f062b90bf3c7290a3364e38c22d5f38b SHA-1: 6826797968147f1cee26cd150604ff65ac042dd1 SHA-256: 8bde718ed0d4bbd9e90e71501fb27e094bc835a43ec67a3d7633916f3d2d5b4a
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 of which point to other PDFs, suggesting a link farm or distribution network. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially malicious content.

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://traffking.ru/123?utm_term=chemistry+unit+8+review+worksheet+answers
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/selesokaze.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/lanezo_xusuxuguwikati_raroviz.pdf
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/a1e1668f3c8e0.pdf
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5fcf6084d7b1a.pdf
    • https://cdn-cms.f-static.net/uploads/4452148/normal_5fd9494b48135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c2246b96-8cee-4bc8-8eac-03b66c0bcc87/56824771539.pdf
    • https://static1.squarespace.com/static/5fdff5e9fc47ae79f60e627c/t/5fe0b3f97514fb3b767daaab/1608561659468/17724485019.pdf
    • https://static1.squarespace.com/static/5fc525d588c99b6d37c2e2ed/t/5fca48d19309303fb83d96bb/1607092433744/parentvue_sfusd_app.pdf
    • https://uploads.strikinglycdn.com/files/20154f66-df29-428b-a6fa-54a0a40239cb/plasti_dip_gallon_white.pdf
    • https://static1.squarespace.com/static/5fc14b3cc89e1c4b8fc11549/t/5fcb3bc421c0486e91917517/1607154628895/80397550323.pdf
    • https://s3.amazonaws.com/takebemanijewok/48834377958.pdf
    • https://static1.squarespace.com/static/5fc5b716a3bf4b14abca1fb7/t/5fcd09ba1e1a4d7de12ed303/1607272891475/mod_herobrine_minecraft_1._14._4.pdf
    • https://uploads.strikinglycdn.com/files/e5ff7d01-523a-42bf-9bc8-80b2a698a636/nccn_molecular_shape.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4cad3570fb44d1f90f9b/1606372526057/shark_navigator_lift_away_manual_nv351.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6b0.bin
a03d78e790247a33c933adc1ce7b733458ac039f55f5b3fcb0f3632aadf1b18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 5308 bytes
font_01_sfnt_off0000d8a5.bin
bd7dede4d5f34cde150b7c69fb439ddadb2fdc95d9eef8071475a92eccd6778c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 11316 bytes

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