Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ab4c75c1eaec50…

MALICIOUS

PDF

79.2 KB Created: 2021-02-28 12:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ca7f22f2881e996b18682a4dedcd6efb SHA-1: 5a8515f0e272579f74fc1dfe17a6d8ae52165626 SHA-256: 06ab4c75c1eaec507356f8f3a6a07a9972d90408bf47653be41c403230977b4d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on low-reputation domains, likely to distribute further malicious content or conduct phishing.

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://golowaki.ru/strik?utm_term=johnson+9.9+outboard+water+pump+replacement PDF link annotation
    • http://kersita.fun/muxizaxutaxaxxdb3.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/jibuxexife.pdfIn PDF document text
    • http://creditpm.com/ios_13_developer_beta_freek9wgz.pdfIn PDF document text
    • http://nashremont.site/music_video_20193nmj8.pdfIn PDF document text
    • http://detonicro.website/kansai_paint_co_ltd_annual_report_20194yad6.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/how_to_repair_a_snowblower_carburetor.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/21e5b6a.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/d140fd3a2f.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://pulutugorivexek.atwebpages.com/adidas_watch_all_black_jersey.pdfIn PDF document text
    • http://fojamemu.epizy.com/adobe_reader_x_standard_free.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/10807713811.pdfIn PDF document text
    • http://sosivaji.rf.gd/didakefupabasobevulok.pdfIn PDF document text
    • http://nozozuwovore.atwebpages.com/how_to_use_a_bushnell_telescope.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/stratco_aluminium_pool_fence_installation_guide.pdfIn PDF document text
    • http://jafoboguzo.epizy.com/how_to_connect_a_universal_remote_to_a_magnavox_dvd_player.pdfIn PDF document text
    • http://kipejefanowisu.atwebpages.com/tipos_de_corrosion_general_o_uniforme.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_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 5556 bytes
SHA-256: 7c12ca24b184b208a0af75442bc9a6caefd9b098a1d2c3b8d3e387a289c51066
font_01_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10552 bytes
SHA-256: 4c5bc747ac0a77c84843815e8cdc03ee13d62ce12e5a22f3aa47b1ee0f65c9b4
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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