Malicious PDF — malware analysis report

Static analysis result for SHA-256 c812ecd219d4dade…

MALICIOUS

PDF

73.7 KB Created: 2020-11-25 03:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6662f9a5a9059133bc1821f13fc9e889 SHA-1: db0f4d4df1c20bb2b35bbf1b1b9e14f42a363735 SHA-256: c812ecd219d4dade444d9b85bae8f34c5ae676012dafc56ff7bab4d71db8da83
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/strik?utm_term=her+smell+script PDF link annotation
    • https://jexumaravoza.weebly.com/uploads/1/3/4/2/134265375/gajabedusor-zamalimidixufeg.pdfIn PDF document text
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/714304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fa710e3d89e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5fbbf6a4d424d.pdfIn PDF document text
    • https://voletiga.weebly.com/uploads/1/3/4/5/134501602/xebolamojapewi-jixelezibufux-wanomexasola-konutirusiw.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/lerixewejo_jasuxazilesofog_vogogosobu.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/xorazuwekula.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/92a5d88b-bd13-4a64-96bb-c0b25d49b626/japodubalor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d12b52-b7ce-45bf-90a6-9ade64fcb2e8/foxit_advanced_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/amoled_hd_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad01524-e122-4b26-a81c-4ac02fd16274/39512339025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae9d32a-091b-48f1-8dbc-d66bd1c2205a/88018052225.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/community_vs_ecosystem_biology.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 4832 bytes
SHA-256: c678b316d510083526bc6d4633c66da3728edda864421d8fb4deb05864a538d0
font_01_sfnt_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10796 bytes
SHA-256: 3de65df020db82f9c9b37f3e41d38414d05c407f5c340ad5a2bce665bd9dd591
font_02_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16368 bytes
SHA-256: 552e926f59ef53231249b6015cc51882b512f7a40c6b17c25f707dc25a221893

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