Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8f276bb51f6097…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 03:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1b7077742c67c00837cb1e86bea7656e SHA-1: c4b3ad58cdacc8f283a5413705f3a2026d5c4d14 SHA-256: 4d8f276bb51f6097662a18d7355edbf677e15a50e92bd77c702ada2d85b3f1aa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=mean+average+worksheet+pdf PDF link annotation
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/damunij-dilaz.pdfIn PDF document text
    • http://lopabobogegise.iblogger.org/self_reliant_examples_sentences.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/GgehcmQ/83670810720.pdfIn PDF document text
    • http://vulinabuwugas.22web.org/voranalezisuwewuv.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/h4IwBig/kidcity_wwe_2k17_halloween.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/8c12a68b7816b3.pdfIn PDF document text
    • http://femukujisidape.iblogger.org/96525567319.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/18809858342.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/ijhiqid/minecraft_godzilla_mod_1._14._3.pdfIn PDF document text
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/eac16e8017a7.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://uploads.strikinglycdn.com/files/3dc0c9aa-a5e3-41b1-8cb8-f9b127887fa2/red_dead_redemption_2_100_walkthrough_part_10_beard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/316b8348-95a5-43b3-b5fc-4fee44f76fb3/puxapanegegujujabagekuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476c157d-ecfb-4b2a-91c0-67b5922b3b74/39686303910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f2db70-85b3-4669-8078-5f7ba2b4a723/39101805501.pdfIn PDF document text
    • http://muzowagujojate.rf.gd/abu_shuja.pdfIn PDF document text
    • http://silapopo.epizy.com/jekoroxiwomilaminukum.pdfIn PDF document text
    • http://xuwizigev.rf.gd/what_are_the_best_cordless_phones_to_buy.pdfIn PDF document text
    • http://wagopof.epizy.com/buzuwiw.pdfIn PDF document text
    • http://sopixixu.epizy.com/chartered_accountant_report_format_for_visa.pdfIn PDF document text
    • http://midugome.rf.gd/xigamosabikupapika.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_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 5232 bytes
SHA-256: eb25cea2195b9f2298c3bfa62ac0b720cb6b173d799c60e44c1064dd28892575
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 11008 bytes
SHA-256: 2c6f08686507cdb1efd18c39834f5dd05396a6e32fda2a9faf6d9cb100ffb400
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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