Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa177a1b52f4199…

MALICIOUS

PDF

95.3 KB Created: 2021-05-23 23:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f1bed14421e6b9ffe452ff87995e51e2 SHA-1: 73e30f02bcb2d48083188a0b5fbac578de9e4764 SHA-256: ffa177a1b52f419934105b8f6807c69767061824a6fbf0b16214629e517dcdbd
154 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://yafferge.ru/strik?utm_term=principios+de+economia+mankiw+quinta+edicion+pdf'. This URL is likely used to redirect the user to a phishing or malware distribution site. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=principios+de+economia+mankiw+quinta+edicion+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_6054716fdeccc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379987/normal_60045c3e9c093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fc8bf31ea52f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481699/normal_60086cd527468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6047adef20113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_603c1031dee28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0435b27-5536-48ab-b6c3-4a9aecd98fc5/anatomy_for_sculptors_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/flute_sheet_music_for_disney_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/gangster_bengali_movie_video_songs_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/75370725057.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/how_to_do_icebreakers_on_zoom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852ed681-50cc-4999-a78f-72fcbbbe2782/the_sandman_audible_full_cast_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/explore_learning_gizmo_answer_key_collision_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/xiwofuvofixarabanag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b42850-c3ba-4162-bdcd-a4902e875f7c/best_way_to_learn_algorithmic_trading.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/68441318042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed55075-5149-4570-958a-04b4d142600c/69666752469.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/fajebolivofim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baa3175-612d-4ee1-9504-0ec939c98af0/83229195434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad531ad-ebee-438e-a074-18627c72e5cc/xikisosewuvududaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/the_boy_in_the_striped_pajamas_ending_reaction.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 5552 bytes
SHA-256: 9927a7d2bf9f29e01400f13105e1f8de39d764be7ba4203782d6b2b0797064b8
font_01_sfnt_off00012d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 13308 bytes
SHA-256: d3da8e47f236f347f362376b740280a2806db6760aea6e7353b11faf46c3c08f
font_02_sfnt_off000157b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B0 16172 bytes
SHA-256: 3cfaae33cfc6fdf23bb529ae6cb8e34b3a984e27e914d26be0c42f77ad36cece

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