Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8d22f5ba2f6719…

MALICIOUS

PDF

85.3 KB Created: 2021-04-18 05:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 418057ee1c625a9b076e9ca2607553f0 SHA-1: c3cfba5204c8f885b0b18cade9d85eabc1b67e90 SHA-256: 9c8d22f5ba2f6719d0a9d64b3e9c6d3ff43f851e3629b35ce0d714983eb28d87
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The primary malicious link identified is 'https://yafferge.ru/strik?utm_term=the+fall+of+five+movie', which is flagged as malicious. The document's structure and link farm behavior suggest it is designed to lure users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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=the+fall+of+five+movie In PDF document text
    • https://cdn.sqhk.co/zarifabidit/AjdXKwP/93053037675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_5fdef497a1ee7.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/bhjdjez/baby_alive_videos_for_kids.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fde91ffa768d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5feb07e776cc2.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/oUHd9WK/53041162612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_601494bc7ab01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_605ee1ec91133.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/hBE8geA/exo_members_age_oldest_to_youngest.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/b6ghBbn/wemiveporobuwuwa.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/6eef7e35-8914-455d-88ad-9791a25a1067/pebozigaxuborizirazodazak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d566c87e-bd6e-4d19-a16b-95783e681b9f/what_if_god_was_one_of_us_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01400cb5-e918-4645-a5c3-59581e9fb916/11918376937.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_4b60d72df3d249aba3d0d556ab06170b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/79110514852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a21c43-c396-45fc-9892-95221371d525/ms_project_standard_2019_download_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be1bd0b-5a05-4875-8207-0af2c0c69dc1/2_digit_subtraction_with_regrouping_worksheets_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e363fa-6018-49d6-950e-c4dd5c5205f1/zutugapizisevomativazewez.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/suzebutokesuzamofo.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_bae00b1714614238884839cf87a0606f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d25480-a381-46ab-8ce7-99357ece55a5/xiwuroj.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_6cf61280f53f4e288e5b80836225fee2.pdf?index=trueIn 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_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 4744 bytes
SHA-256: 09e4b88a21456d96c789f683d4a8fd6f08fc3556c57f7b99f9cee837aea27ddc
font_01_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 11076 bytes
SHA-256: 9f497a610427224dd6531b206725d3efdc2752135b7cace2f2dbb5b1e586fbe3

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