Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73352adffa9c564…

MALICIOUS

PDF

78.6 KB Created: 2021-01-22 09:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c4b3d9d8629ecce3f16b760463bc7db6 SHA-1: 2b1393093d7e455381fd8a789806a492fdac7275 SHA-256: f73352adffa9c564d99b5c5de565575a80758dd69891a088273b72916b7293bd
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=netherland+dwarf+colors+chart'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a compromised site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=netherland+dwarf+colors+chart In PDF document text
    • https://cdn.sqhk.co/dofexoxev/ja2wiic/knife_steel_composition_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/76ficYJ/sofitixulaxututit.pdfIn PDF document text
    • https://site-1177840.mozfiles.com/files/1177840/91584944622.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/oickjcH/zofogij.pdfIn PDF document text
    • https://cdn.sqhk.co/sapugelezuf/lihf9BV/apple_messages_app_for_windows.pdfIn PDF document text
    • https://site-1171825.mozfiles.com/files/1171825/chat_app_android_with_firebase.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/hQRMfKl/world_war_z_season_3_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/Ckljdhg/zuvizamuditalebiso.pdfIn PDF document text
    • https://site-1168233.mozfiles.com/files/1168233/84534828860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492875/normal_5fd0424b1369e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492880/normal_60013c0f5d3e6.pdfIn PDF document text
    • https://site-1177263.mozfiles.com/files/1177263/wood_burning_stove_installation_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/iahggha/fold_up_electric_bike_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/hhXgige/calamus_a_ttrpg_map_maker.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
    • https://s3.amazonaws.com/fofeguj/luzudezutiluxofawifide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 4912 bytes
SHA-256: 0033c442b6bbca3721417fe0052d91026461483c83d3ca27ffb94e061782f679
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 10652 bytes
SHA-256: e7e490c58a9fef28b66642e38b781398f7429b590096a64d48987efdef6bc9d5
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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