Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b23190ce05c092…

MALICIOUS

PDF

80.9 KB Created: 2021-02-26 02:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cdafe3836db004991f583b0872c96f82 SHA-1: c1916e69360efd46bb4e8746b472a52d062033a7 SHA-256: 35b23190ce05c09245ab7d5b1f839ba9a41ed51275a5197d340301e136788e03
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host many links. No scripts were extracted, but the presence of many external links is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/aws?utm_term=minolta+srt+102+battery+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474987/normal_602ba137dfa29.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/why_no_more_black_books.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/65505931523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ff691db1d0d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_60208ce7d0d22.pdfIn PDF document text
    • http://xujofalidubof.iblogger.org/97679969690.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_reset_vivint_panel_frozen.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/how_to_add_camera_to_summer_infant_monitor_wide_view_2.0.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/5083961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fcc2bca4f0be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_6003719926d7e.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/bumojukidigamosu.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://gawekavadave.epizy.com/75410624398.pdfIn PDF document text
    • http://mujotipaxoxi.epizy.com/is_it_cheaper_to_build_a_kit_home.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/hoover_steamvac_carpet_cleaner_no_suction.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/22920444537.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/craftsman_air_compressor_20_gallon_1.5hp.pdfIn PDF document text
    • http://nufagogofuj.epizy.com/injury_report_nba_rotoworld.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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 5440 bytes
SHA-256: adbe80e339a27a79754cd40eb5d86f4efb5b1e531cb5d33be2f8ed2cabe0870c
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 10508 bytes
SHA-256: 3546fc4309615d07ac6aeaf7bf10d2fafb82f20caf522d389501087518e20062
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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