Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8eefe21293a2d5…

MALICIOUS

PDF

84.1 KB Created: 2021-04-06 20:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9e2d79b387fbb3d2dc91a7e6787051a0 SHA-1: e84523ce97691ab1339ad246e3abbcf5d84588b8 SHA-256: 4d8eefe21293a2d5490f5d05bc7e9881eaa65d09c3751bd25cd274c53d76d4b4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. The presence of multiple external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest an attempt to redirect the user to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bologen.ru/strik?utm_term=carry+on+my+wayward+son+lyrics+neoni PDF link annotation
    • http://dazavaluk.mygamesonline.org/derivatives_of_algebraic_functions.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/8267e.pdfIn PDF document text
    • http://damita.fun/how_to_use_a_curling_iron_for_beginners8927n.pdfIn PDF document text
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/229830.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/the_ugly_duckling_story_for_kindergarten.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/rujeseru.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/aladdin_story_free_download.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/d9bb7d6.pdfIn PDF document text
    • http://xovuwut.iblogger.org/fufez.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/copernican_revolution.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/simon_vs_the_homo_sapiens_agenda_chapter_summary.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/xemogevopexibasoperogina.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/59772316913.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/zonexagonusetopinwtpf.pdfIn PDF document text
    • http://pc-remont.website/new_naats_2019_audiox0uso.pdfIn PDF document text
    • https://wevejabunom.weebly.com/uploads/1/3/1/4/131406075/doxomaduxejebe-nuwaruzewitupaw-naxalozakube.pdfIn PDF document text
    • http://timecodes.net/linetusoka3eios.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/02d62ff4b2d3bb.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/sample_of_office_accomplishment_report_format.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/zezujajimuwugi.pdfIn PDF document text
    • http://closemaze.com/67550928291p25f6.pdfIn PDF document text
    • https://javimitama.weeblIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nobapizasiwe.myartsonline.com/jewirigerabagupawojuwari.pdfIn macro / runtime command snippet
    • http://wazaralod.epizy.com/xajesat.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_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 5184 bytes
SHA-256: 99c2098824434673a422a711bbd606e769ed7f9b4d464885e3a635dedb68dbaa
font_01_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 13080 bytes
SHA-256: 70b6ea14bd8b7d0588b375fc07e27c4010489892b0659d812b8de7c5f4f77c2d