Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef26a8d35e14659…

MALICIOUS

PDF

85.3 KB Created: 2021-04-06 21:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f396073bf32ad108dadb343d050bb925 SHA-1: 558c3b10807b07de0de1b60664fe03c0de081d1a SHA-256: aef26a8d35e1465961d38d8380529e3025a34cc1995fb44327a31fa2f27b9e3d
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 0.9925

Heuristics 5

  • 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 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=bissetriz+exercicios+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454807/normal_600be5d33a2fd.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/kagajepegabeb.pdfIn PDF document text
    • http://sobuvide.mygamesonline.org/15531416430.pdfIn PDF document text
    • http://wegoradubi.sportsontheweb.net/battery_capacity_tester.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_605b94d352b83.pdfIn PDF document text
    • http://esparks.ru/kjv_study_bible_app_for_androidgj1cb.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/breve_storia_della_lingua_italiana_marazzini.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/kexanir.pdfIn PDF document text
    • http://okclub.org/med_el_sonnet_2_easts4h0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6010a3641cf58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472766/normal_5fcc8618e49ea.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/what_is_the_adjective_of_see.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/60780474175.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/cctv_system_installation_guided05rm.pdfIn PDF document text
    • http://malespw.xyz/why_is_my_ninja_blender_blinkingrf3ph.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/3cJufii/grocery_pallets_for_sale.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/bowflex_elite_reviews2hik8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_602ed8079f43c.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/zijesowukep.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/iihbndF/nimerodos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bee08bb6-d8c1-4cc5-89f0-d6ac88a4f64a.filesusr.com/ugd/8b8a1f_8d80db08f04445b7b72e73c288b51185.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_a25e4fb83c1b4160a1faf96daddf9693.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_43ff6338e37142399b9eff5ceb072bb2.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_71c92236b8674eab80ba3c419459e098.pdf?index=trueIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_fe321f1452f24cd5931b1cbd9b9f4292.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 5076 bytes
SHA-256: 646e1d832dfe7957746a77d96aceabac64a7b4a5b772e9e3b55497c0fd40dff2
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 1764 bytes
SHA-256: 6e2aa80ca001106dd17c283e3771243746565de684de641cefd01ddbdcc20cc3
font_02_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 13572 bytes
SHA-256: 7952cf792eade5608e9577d5c4a1e2e2f5614aed40086016e3d3a58d0afaf49c
font_03_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841