Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ce8d846a29bf97…

MALICIOUS

PDF

68.4 KB Created: 2021-02-27 19:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6f1ef2a799cb36ae00a72dfbf5d7a8c8 SHA-1: df05c42b11cf2b4feeb4099c38e808f91c716447 SHA-256: 07ce8d846a29bf9755785af7c639cef477ca86ac1e2c3cf17196aa51ef25ad5b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'cleaning paraffin heaters'. The presence of numerous external URIs, many pointing to disposable hosting domains and link farms, strongly suggests a phishing or redirection campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for delivering malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=how+to+clean+paraffin+heater PDF link annotation
    • https://cdn.sqhk.co/waxobakal/8idGhiy/xamepom.pdfIn PDF document text
    • http://antonioit.fun/ejercicios_de_rimas_para_cuarto_grado_primariazshqv.pdfIn PDF document text
    • http://help-mediasupport.com/vevufexdllvg.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/vieiege/zombie_hq_game_download_jio_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/AgjggNf/azara_wheels_520.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/what_determines_standard_enthalpy_change_of_formation.pdfIn PDF document text
    • http://umdtheatre.ru/pelcula_de_titanic_completaro792.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/32052678687.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/ukLjjy8/no_button_sound_iphone_video.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/char_broil_tru_infrared_parts_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/ggtnBFp/6263816651.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/jhjNhjS/toilet_running_water_kohler.pdfIn PDF document text
    • http://pek-24.cc/rikigotozutupowurixixamalgixe2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/games_coming_2020_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/13339904765.pdfIn PDF document text
    • http://xovanesoku.epizy.com/citizen_eco_drive_titanium_wr100_chronograph.pdfIn PDF document text
    • http://xakanuf.epizy.com/momanagatevo.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/lodomi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/75386956229.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_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 4980 bytes
SHA-256: 1459bc44c57f9203592ccfeda25d36bc6b414bd048bfce476a973d1ed13df2a1
font_01_sfnt_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 9772 bytes
SHA-256: 26fb8e827da275008b0143f09ad9b8babe62224f03694ea012fc837e614a9892

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