Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51e44c71749654…

MALICIOUS

PDF

90.4 KB Created: 2021-03-08 03:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 10896fb4f79f05518c23b13ec3c75000 SHA-1: 006eb9880bdca5ecca83363adf79734fe6d95f66 SHA-256: 1c51e44c71749654ae10fee403b57261ba9261ee770bfcf91646229d20032346
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a significant number pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious 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://soxebez.ru/strik?utm_term=thinking+mathematically+6th+edition+access+code PDF link annotation
    • http://websporizlehd.com/free_lagu_karaoke_mp4qmdf9.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/how_to_connect_motorola_bluetooth_earpiecelnrwh.pdfIn PDF document text
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/kopopojo.pdfIn PDF document text
    • https://wifebazeb.weebly.com/uploads/1/3/1/4/131482826/sidasureme.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/ribudulotip_nozawutit.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/9003896.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/lojitaronorozerituve.pdfIn PDF document text
    • http://about-igsupport.com/leniwunegugifagidxomuw.pdfIn PDF document text
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/nudonulenige.pdfIn PDF document text
    • https://bukenazupe.weebly.com/uploads/1/3/4/5/134584610/xenof.pdfIn PDF document text
    • http://laxana.ru/free_editable_calendar_2019_template428gw.pdfIn PDF document text
    • http://iglivesupportteam.com/890436975910rzyj.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/4e26ea2b-4e59-4cdc-962c-c3eec2010515/11793231796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7817f795-a5a0-4f1d-b8e5-9a7e0f2a5bcb/left_handed_remington_700_bdl_308_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511c0a66-24e1-47bc-87ce-735af21a1356/old_school_hip_hop_songs_with_good_bass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b2fd04-bc24-4523-b837-912b21c235ea/13803977838.pdfIn PDF document text
    • http://laxowukuwex.epizy.com/foxefavumomimilemenazum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8da5e8-61b2-4472-a669-8043af0f495d/valence_electron_worksheet_lewis_structures_answers.pdfIn PDF document text
    • http://pewusufep.epizy.com/dufisoluxiwu.pdfIn PDF document text
    • http://lafanibawonol.rf.gd/azhage_azhage_album_cut_audio_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d298a7a8-0655-4a60-894a-295d3e11aa06/nuvozokofu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 5524 bytes
SHA-256: a858279132c7e4498aaea108cb44856317254a29dcf5cfbd1ccd3fd8b38ee557
font_01_sfnt_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 11600 bytes
SHA-256: c30716636884fad0c6574e3a67b5fd849db493cb6c60303c83b25aaa90bfd297

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