Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9031f8fa620c4d…

MALICIOUS

PDF

74.5 KB Created: 2021-06-06 14:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6502e0203db51c49e771a3c5d8dd81c SHA-1: e7ec359aaad22de7d60e604698004262e92fa884 SHA-256: 3c9031f8fa620c4d894403351d0c91cfb0dc96be7c9f32a32df9330205ec5a7d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://huntic.ru/pbw?utm_term=what+is+the+role+of+an+usher+in+an+event PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392220/normal_604820a916aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453540/normal_60302e22ce703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_6024bde756f04.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
    • http://razodegotit.pbworks.com/w/file/fetch/144720021/73071990766.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/rukote.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/shiva_tandava_stotram_powerful_mp3_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf9f10a-5182-463c-b2ba-57ba32272889/63603947347.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144493683/kawasaki_motorcycle_service_manual_free_download.pdfIn PDF document text
    • http://sixuditar.pbworks.com/w/file/fetch/144559467/how_to_use_simple_interest_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb0ece1-f1ce-422e-8015-a4e7ffa2c9b4/49221867578.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/topic_and_concluding_sentence_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7863719-f3d6-4352-a60c-6a6e8617ab65/outlook_web_app_mailbox_cleanup.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/jivomirex.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144518352/vazukidutibawuvesu.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144472803/wigekowevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae4b051-90b1-4493-ba6e-5e0623dae005/wirotepomukalimukiwutek.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/21718998028.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144424917/23559345681.pdfIn PDF document text
    • http://wemekojezum.pbworks.com/f/download_imvu_mod_apk_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 4812 bytes
SHA-256: 7f7e8eaa24999055f8e18bbe429ee5f45a83286f335724ce6757ab4c3f4bb3e2
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10328 bytes
SHA-256: 202a6a42e59396cf2119792b37fa3024bbe4746397b74e60d5ea1ba1a1ec7bb2
font_02_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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