Malicious PDF — malware analysis report

Static analysis result for SHA-256 52135d3febba9784…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 08:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e6e224016ecae1f377a267fdaff4734 SHA-1: aeb81e701f2f66b75c5c5f22f604b5417d83a3d9 SHA-256: 52135d3febba9784ddba3c7cff6b1a558fdd1202c80c435e2fc912688c98879d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, with a primary one pointing to 'https://jumiwimov.ru/strik?utm_term=expository+essay+ideas+college', suggesting a phishing or scam attempt. The document's structure and embedded links indicate it functions as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=expository+essay+ideas+college PDF link annotation
    • https://cdn.sqhk.co/vozevadijut/gdoM9he/depunito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fee2731a8c3c.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/sjihB7j/on_my_own_song_ross_lynch_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_5fe7d51dd1d93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_6049bb2fa61a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_60181ebb07164.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/hfjf5wV/42496235734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5fff365a80268.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/aJhisgg/sakegosufevidimudifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_e7ac1bcce1224d2cbd6285ebd2e1ae4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab242527-739d-4c78-89a0-c12f83c86b6e/why_is_english_composition_important_essay.pdfIn PDF document text
    • http://nipesuvaz.epizy.com/totubogegoliguzurukoruxa.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/rajutomimaxulew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93604b4b-3a15-4c53-804a-25443a1f7376/afterglow_headset_mic_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/cub_scout_clip_art_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/cdf_and_examples.pdfIn PDF document text
    • http://tapogexolewiji.epizy.com/sublime_format_code_c.pdfIn PDF document text
    • http://zaxatuparogojix.epizy.com/zovorojobibabomataji.pdfIn PDF document text
    • http://xijovapafibowuw.rf.gd/70598313506.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_4038fa08e66b4343889949a54e4f4e53.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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 5368 bytes
SHA-256: 664512d69836fd45900c3915bd652e72848a1f2b7e52ed17bc6d6c99630598af
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10392 bytes
SHA-256: 3faa741d44bd5f22d972c17f2aa6477e30014043492cc2f987756834e37febbd

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