Malicious PDF — malware analysis report

Static analysis result for SHA-256 182a52fd89c41b23…

MALICIOUS

PDF

87.3 KB Created: 2021-02-16 06:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ebb125bf010996043112d7e3ef8a234 SHA-1: ce67d16c60d6732035d52f01bbb1423644ef8e5b SHA-256: 182a52fd89c41b230ca924e2935933c85689a47269408e6fc4aafadaa3965bc6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/123?utm_term=derive+maclaurin+series+for+e%255Ex PDF link annotation
    • https://xajasirofoxuki.weebly.com/uploads/1/3/5/3/135330212/8cdc90447a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_6021498b1f36c.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/gigebaxupov.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/csribVk/detitumusibix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fe8c90e1dac5.pdfIn PDF document text
    • https://gipewiraxo.weebly.com/uploads/1/3/5/3/135334151/1099413.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hhi4uji/smartmusic_login_code.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/8khdwjb/the_yellow_cab_man_1950_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5fd10c5c544a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5ffc330cbf0ea.pdfIn PDF document text
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/rafujovojomased_vezedoz_wubitukokuduves_gukepidipevo.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/hgjgfjc/pexuduzogozigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_60155998bbecb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rusuxagek.rf.gd/78142115340.pdfIn PDF document text
    • http://fawogalupa.epizy.com/browning_trail_camera_btc-_7fhd_manual.pdfIn PDF document text
    • http://jotikovan.rf.gd/zexorutagusufati.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/arduino_16x2_lcd_display_library.pdfIn PDF document text
    • http://nanoxujam.epizy.com/constructions_worksheet_ks3.pdfIn PDF document text
    • http://teruwisap.epizy.com/sheep_brain_dissection_lab_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/vonofidoji.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/25865918468.pdfIn PDF document text
    • http://pugagewuda.rf.gd/95448271764.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 8452 bytes
SHA-256: 4fc654464565cd8fd4bf0ada81d8419fac5b4e5f758e8d717ba78d1355ed013d
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 5204 bytes
SHA-256: c16e6daa401fad8922451f26bad9e7ecd6ad2a6af67108e661d3ff2975160ff9
font_02_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 12204 bytes
SHA-256: 2a0af901d74baf6a01a211c8e610c494d53f0ae7de65e170ed76d67241c48ea1
font_03_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 16080 bytes
SHA-256: ae4c1039909c6b18400a693790947520403f0a9c3cdc5bdc37254682f4165006