Malicious PDF — malware analysis report

Static analysis result for SHA-256 178f832f8378a08c…

MALICIOUS

PDF

94.4 KB Created: 2021-03-30 04:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 72db0181009328503395aa47ee459aea SHA-1: 552745f31f36d4b6a55e6e057a08796a3709c628 SHA-256: 178f832f8378a08c4f4c9df37791781ab86af6ace7a0fb6916742e3024a3e103
126 Risk Score

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 0.9993

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://maypoin.ru/award?keyword=infecciones+por+enterobacterias+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451940/normal_6035fb596c95f.pdfIn PDF document text
    • http://jutidewolojura.mypressonline.com/99759786778.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/20156632029.pdfIn PDF document text
    • http://radanukodufam.22web.org/xuwepazejedaruxepikapugi.pdfIn PDF document text
    • http://benaletuzulug.sportsontheweb.net/limirofafumanegifomodala.pdfIn PDF document text
    • http://towufugejudet.iblogger.org/paradise_lost_as_a_classical_epic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_603323008423f.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/naroxetowapewifigafivowu.pdfIn PDF document text
    • http://loxiturizule.sportsontheweb.net/sanitary_inspector_book_in_gujarati.pdfIn PDF document text
    • http://rajeziriga.scienceontheweb.net/bovubuvanevu.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/tinakimelevolurokipasusax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_60029b2dd2b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_602e807d53822.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/leferedixenunemodajuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd160df87557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vivusefodubelep.epizy.com/biometria_hematica_valores.pdfIn PDF document text
    • http://novoboninixeme.epizy.com/mapa_playas_cantabria.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/parasitic_zoonotic_diseases.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_c1d56246150d4c658c744b7b28578e04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/block_ads_google_chrome_android.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b7e3ba0c68924d4eb892f101f6857184.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_2cbdf3a7777742bfbdf7cce60691cc1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/fawejazokixibopoguxoror.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_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 5196 bytes
SHA-256: 2b03c56f2b39bbcbf6dfaeee96155b0ab5569d5dfc6f66540211e5f3ddae3080
font_01_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 12108 bytes
SHA-256: 7660835bf0fc2619e9075a77143310a0402e6fcd2153655f3ada54b0977f1179