Malicious PDF — malware analysis report

Static analysis result for SHA-256 312bf83f1896799b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-27 14:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: af17c5444f1f6e1dd6581d871f114683 SHA-1: 904c6d10398c078b95de5edf9942a33b1d5427b1 SHA-256: 312bf83f1896799b610a2ce8780f34779d2709f18af2339789ccdb47e2b7f16e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of external URIs and the ML classification strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=pdf+topology+without+tears PDF link annotation
    • http://wejuveziwep.mypressonline.com/nogaxijotuvifekigijejife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_600a735fe33f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_5fe8f9d040fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fd7a3a97e879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5fd16e38a7709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6051bf40a5bd2.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/46798329071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_602712fc70e97.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/epigenetics_lyle_armstrong.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/xadogemobenibifomimakora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fc95dc82f0b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5ff7c675bed48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_605be0a9d73f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fdbcd973ef51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xuvemotoguno.epizy.com/la_casa_de_los_espiritus_personajes_caracteristicas.pdfIn PDF document text
    • http://fojodopid.rf.gd/book_report_the_wonderful_wizard_of_oz.pdfIn PDF document text
    • http://wivufakumetewiv.rf.gd/alfa_laval_plate_heat_exchanger_manual.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/anti_ragging_form_download.pdfIn PDF document text
    • http://sabepusejoponi.epizy.com/keguv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 5272 bytes
SHA-256: 23f1ff5e44476eebe58c9783d7637a6d4880c42989c5b1f9f2fba5541fe02b91
font_01_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 11140 bytes
SHA-256: 9652b1966b966868ce0ff26f40e49bd01af1ad2dcd62ca9b2a699a60d97aaddf
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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