Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e568b582f6879e…

MALICIOUS

PDF

93.3 KB Created: 2021-05-07 11:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c994e110c00e43d294e1e177e34e1654 SHA-1: 95a359e57398bb4991f46f4f310edcb7f3d1fe41 SHA-256: 85e568b582f6879e7b4224346c835a7153dba12969dc1329a2030fd520afba26
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of malicious links suggests an attempt to lure the user to a harmful site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=matthias+quotes+six+of+crows In PDF document text
    • http://tefuvawilutir.mypressonline.com/3539589105.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/toxad.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/bruce_lee_son_death_scene.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/14670042683.pdfIn PDF document text
    • http://saforanewasodu.22web.org/list_of_european_financial_reporting_standards.pdfIn PDF document text
    • http://letonibi.iblogger.org/rekolafi.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/how_to_cite_the_niv_bible_mla_8.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/16533301788.pdfIn PDF document text
    • http://pedazupemadid.22web.org/alabama_motor_vehicle_bill_of_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_39bb9efc7d7547cf888941704aab9a12.pdf?index=trueIn PDF document text
    • http://jetiloguj.rf.gd/admango_ad_spend_report_2018.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_bd97747ba10549ca9935c9a4c3ffb7e1.pdf?index=trueIn PDF document text
    • http://zagofij.onlinewebshop.net/10223658271.pdfIn PDF document text
    • http://nifuwisenomu.epizy.com/92857568695.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_40295d2c90c648119e57b33dc7d69865.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_e94ef0dfd3e2488da85a1dd88844b4bb.pdf?index=trueIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/ledumubajivomesefezurok.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/what_are_teslas_resources.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/bopamola.pdfIn PDF document text
    • http://zisunajupanege.rf.gd/case_studies_in_pharmacy_ethics_2nd_edition.pdfIn PDF document text
    • http://kagufunoziwezu.epizy.com/billboard_music_2018_free.pdfIn PDF document text
    • http://kavanovadegutok.rf.gd/fawupobatajibijomozo.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/making_a_toga_with_a_fitted_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/magonujapiwap.pdfIn PDF document text
    • http://fokogijisigife.epizy.com/zuxelisarekejaguron.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 5228 bytes
SHA-256: dd1c244374bfc174b1074e6b9fa214f985dedb396edf05afb5ea422a3e05032c
font_01_sfnt_off00012bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEE 11164 bytes
SHA-256: ab1119f630ccfd7c3d39b2d1e30f9439c7e44da96236591ff9ebbc33cb790de9
font_02_sfnt_off00015170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 16396 bytes
SHA-256: 4e74c91031341c06b915725d15f052d77c33d75b7b3102a675f469d94d5ad539