Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a27e439d8edf7…

MALICIOUS

PDF

76.9 KB Created: 2021-05-08 19:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6428e82562ee6f4bfa08daa8ea72d4f3 SHA-1: e5c72b3c254604d66fe68ccfdf4cdb9d852187b5 SHA-256: 888a27e439d8edf7e0fc03405081daa868d2c324b12d984efde10009f55b8dfd
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 0.9996

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://jacksth.ru/strik?utm_term=how+to+get+a+5+on+ap+spanish+language+and+culture+2020 PDF link annotation
    • https://gubojipupulep.weebly.com/uploads/1/3/4/3/134359502/sasumorosatafe_tezifafutipemo_wutipofel.pdfIn PDF document text
    • http://zonasexos.iblogger.org/rajasthan_patrika_bhilwara.pdfIn PDF document text
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/6679756.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/palabras_en_kaqchikel_en_orden_alfabetico.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/etMghyB/35299003903.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/56805853158.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/hjvV6jc/vikikulidu.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/gdmIjJc/lodash_template_example.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jicBZih/major_mayhem_2_gun_shooting_action_game_download.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/how_to_rewire_brain_for_happiness.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/class_action_research_proposal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_6d8d995144bb4ba993f1b8ec24440960.pdf?index=trueIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/quererme_mas_bernardo_stamateas.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_12fb362201f04785b7b66c35f58ffd38.pdf?index=trueIn PDF document text
    • http://duvodix.myartsonline.com/clicker_products_klik2_programming_instructions.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_26506a650bc545838c972bd0d5850785.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_28921a533f8c41febed261898f33fc70.pdf?index=trueIn PDF document text
    • http://parusorudejes.epizy.com/92806081824.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_34e70b4dd149424abcf10231b76a60c6.pdf?index=trueIn PDF document text
    • http://zopuvebiwu.epizy.com/75671648222.pdfIn PDF document text
    • http://pevexuzuzuku.rf.gd/14705394152.pdfIn PDF document text
    • http://vunojagona.rf.gd/pixevunimi.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_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 5784 bytes
SHA-256: bdae05faa319b0402bfdef72cd6ecae0b9c58ffa9514406bb48182d541aec24b
font_01_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 10456 bytes
SHA-256: 6948fb214cbb289a89d6fb490fad99140ab20938b07220b5d6d25fd6d2f0c58e