Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec63e6a81a0b8d1…

MALICIOUS

PDF

67.1 KB Created: 2020-12-15 18:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fff704262898b5c81282e221034fd34f SHA-1: e44a825616c9e1e684db04758d30bd2a303adb45 SHA-256: 4ec63e6a81a0b8d1e1ded9030bc702ee3ab8eeca1be91de475dfbe17fc364238
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 detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with heuristics identifying it as a link farm designed to direct users to various disposable hosting sites. The presence of 'utm_term' parameters suggests tracking or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=qad+ultra+rest+hunter+adjustment PDF link annotation
    • https://veforolafumokiv.weebly.com/uploads/1/3/4/3/134340642/8672923.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/eedf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_5fd8717f628bf.pdfIn PDF document text
    • https://varemajog.weebly.com/uploads/1/3/4/5/134585454/6305317.pdfIn PDF document text
    • https://nuzolegan.weebly.com/uploads/1/3/4/5/134576582/301ad52719c.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/2953475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fa5b674d7d30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4c63dd26ff1194f8cbdd0/t/5fcff0a07ece0d48038dcc87/1607463072710/dibitupusuxerisaken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328cc457-ebbf-42a4-bb35-79602c919a58/spongebob_i_couldnt_afford_a_gift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31ad29a-02eb-4eb7-b652-53c6e2381b5f/66330736386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b342b3dc-6a10-456b-a416-051521371da3/86951648950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5021891b-ca2a-46a4-a197-f634d7b5569f/playa_vista_branch_library_los_angeles_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7ed9da-ccb9-48ae-9501-e92c7e5ca20d/tai_chi_training_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf7f4dae50a014586c9dd/1606219765575/average_round_dining_room_table_size.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_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 5204 bytes
SHA-256: bbd3b306bf25f8cdecd30046b42d77b2aa86503c305e975a11f96eb605040be6
font_01_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 11316 bytes
SHA-256: 27f6a53cab8ed70c4cedb3ae55ffd05336ae2b39628189f67fc1f6529859968b

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