Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6dd4b78a2eb096…

MALICIOUS

PDF

85.1 KB Created: 2021-05-09 10:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5fd8481e893ff8625996c4624cd91546 SHA-1: 521c723c7c68c646bb806f412654f90842457a39 SHA-256: 4c6dd4b78a2eb096b47c5f1c811116ca9a62e89071dee4ec687bf067e46eda99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=ref+code+s0a00, which is likely used to redirect users to further malicious content.

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
  • 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.
  • 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://midufefew.ru/strik?utm_term=ref+code+s0a00 PDF link annotation
    • https://wiwufupa.weebly.com/uploads/1/3/2/8/132814928/f7c33ab.pdfIn PDF document text
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/3771851.pdfIn PDF document text
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/xokafabaruvu.pdfIn PDF document text
    • https://xibagepop.weebly.com/uploads/1/3/1/4/131438114/fofume.pdfIn PDF document text
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/8573727.pdfIn PDF document text
    • https://menedufigejit.weebly.com/uploads/1/3/1/4/131482930/kuridijumogigiripin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393186/normal_6002fc7dc2954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_6027122ae89fd.pdfIn PDF document text
    • https://mokasinerosun.weebly.com/uploads/1/3/2/6/132682676/xiwivu_zipobagudi_gevuf_zowimo.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/porukit.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/e48f24edd.pdfIn PDF document text
    • https://sigusesozafulo.weebly.com/uploads/1/3/4/4/134401708/414932.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/4307246.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/680a3746-3578-4a3b-ae8c-4afe355cfb12/what_does_the_bible_say_about_seed_and_harvest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba28fec-913d-44ad-81cb-febab0345dbe/65473474295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab6605f-7dad-4064-bda3-98000707356b/66360032193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2e3400-c4f2-4b72-8944-bf3238f01773/competition_demystified_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae333d59-508a-4c0c-b39c-bf5f3c66064f/fun_games_to_play_on_zoom_with_1st_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e62723-967f-43fc-96a8-ebdb33fa71a7/19413674830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ec2202-205a-4219-8118-4c65f65f33a4/jupuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bac635d-70df-4f3e-8d20-3498adbd09cd/sandisk_mp3_player_bluetooth_pairing.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_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 5036 bytes
SHA-256: 83ec0771bbec6453b6547fa50a29b1541ea5b85701af2b024a435b5e27898dbc
font_01_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 10784 bytes
SHA-256: f18f58fbaef243a870e99017fd3c484868f18dd7175dc1f731c473bf28e03b52

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