Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eb983bd3730652…

MALICIOUS

PDF

73.2 KB Created: 2021-06-03 22:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c8c120cf2c6bc1c2fcfbce40bf854dbd SHA-1: e36c2f43b499b52d97820f3affbc48bf50352adb SHA-256: 78eb983bd3730652d6db684e124532678dbf43ae7e2d84607a00e236bcee6cc1
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://pistant.ru/pbw?utm_term=codes+for+lego+star+wars+complete+saga+wii PDF link annotation
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/votamifim-xagujonetotuw-tarutat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6051a5260c92d.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/pomipekegevujevupuj.pdfIn PDF document text
    • https://kadikodol.weebly.com/uploads/1/3/4/7/134747526/pewimob-bekuf.pdfIn PDF document text
    • https://gufovijer.weebly.com/uploads/1/3/5/3/135339237/ab2f5976ac87555.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/4276423.pdfIn PDF document text
    • https://wanujonoguj.weebly.com/uploads/1/3/1/6/131607110/zevupa.pdfIn PDF document text
    • https://turetajonu.weebly.com/uploads/1/3/4/6/134629909/da5129afa75f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5ff2972024866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_601ead8e6cc7a.pdfIn PDF document text
    • https://dunebuka.weebly.com/uploads/1/3/2/6/132682868/c549ebc20702ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://farejutotej.pbworks.com/f/60981078385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0df3a3-1e37-455f-b198-dce36f8eee21/how_to_use_bump_head_trimmer.pdfIn PDF document text
    • http://jobagej.pbworks.com/w/file/fetch/144564381/zikukonirubakisinomafuso.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/is_tracfone_iphone_unlocked.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144447942/47025888138.pdfIn PDF document text
    • http://favixose.pbworks.com/f/sejobux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31df3c5-075b-4b6f-980c-f4b48ec5dd1a/54823829658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a65541-a055-4dcb-b277-a5f93869e0df/xopol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4498ce3d-1f62-40d4-a9e3-096cbf5d8dbc/java_swing_login_dialog_example.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 5472 bytes
SHA-256: 61eab6dbf76abdfe9de7298ed80c10aeb353f49378a6fd9932c03426316492be
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 11072 bytes
SHA-256: 243b7e0004fe473b4897fbd58f79ba3683ed3012a6ab27c36ece53ba42209f72