Malicious PDF — malware analysis report

Static analysis result for SHA-256 703a4b464e860b47…

MALICIOUS

PDF

85.1 KB Created: 2021-03-23 04:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3c0e66b27ef41c721322513f868e242d SHA-1: 4bc747aae42de2836003ec78a39fbe68e5054de8 SHA-256: 703a4b464e860b47783d1613644773d0d7cd87c69064d0b695c15e1294de5574
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 0.9997

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://baarspo.ru/wix?keyword=area+of+parallelograms+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/jawuraxexije/bCKhihh/vavovarutavowogatutopugu.pdfIn PDF document text
    • http://mufadetajamojo.iblogger.org/rizituv.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ihcihEf/sijunilanogavezumawagat.pdfIn PDF document text
    • http://migajipanijezep.22web.org/food_near_cannery_row_monterey.pdfIn PDF document text
    • http://rumulive.iblogger.org/zakejisixadowibezuxigisex.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/R4xigbK/vusuwasitaderiko.pdfIn PDF document text
    • http://dokuloraxu.22web.org/how_to_change_ink_cartridge_hp_officejet_2620.pdfIn PDF document text
    • https://cdn.sqhk.co/dudavizi/ja6viaF/19529682063.pdfIn PDF document text
    • http://vapurese.22web.org/jebadep.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/fitujiginu.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/yLjfiit/25672039171.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/S4Z9FI3/wukasodesovovanagolapa.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/CjjIgcm/zedonege.pdfIn PDF document text
    • http://sidixul.iblogger.org/20274396576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokolutomi.rf.gd/ct_file_trong_foxit_reader.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/tesasezomusolijikigimope.pdfIn PDF document text
    • http://kufekuduvedeni.rf.gd/how_to_make_a_blueberry_smoothie_with_yogurt_and_milk.pdfIn PDF document text
    • http://zudozam.epizy.com/abu_catholic_songs_audio.pdfIn PDF document text
    • http://maxabuxaf.rf.gd/how_to_calculate_compressed_air_flow_rate.pdfIn PDF document text
    • http://bimimikojawador.rf.gd/boeing_737_300_maintenance_manual.pdfIn PDF document text
    • http://mezuvisudaduvo.epizy.com/sosobegesokulo.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_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 5600 bytes
SHA-256: 03d9c434467f79bad16a868d041d624ee21687085ced003f4f674a9767c05c2f
font_01_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 12308 bytes
SHA-256: beecc854a6f1b446d37a9da75ffcc399f6545d1d3180dcc19db43f2b00a5f9a5

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