Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdea37b1008f8fe…

MALICIOUS

PDF

71.6 KB Created: 2021-01-22 23:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6708838da77b2aeb7b6044f2a5ac6a72 SHA-1: 16867e8e7f29445818b4208eb98f2505e3de1fb4 SHA-256: fcdea37b1008f8fe6fef22ee25b0e2405d6da3358e90fc8bb6ef75171053d64c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=harpsichord+sheet+music+free
    • https://cdn.sqhk.co/derebeduno/vDjfVQv/farm_heroes_saga_games_free_download_for_pc.pdf
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/wubuxo-xaxunof-xejenarisozitux.pdf
    • https://cdn.sqhk.co/fakomuse/lsiInij/70053027336.pdf
    • https://xebutalumibafa.weebly.com/uploads/1/3/1/0/131070398/448.pdf
    • https://site-1174052.mozfiles.com/files/1174052/vimevotu.pdf
    • https://jibisovewa.weebly.com/uploads/1/3/4/6/134653871/vupajuvike_dotiz_zubadepizenamor.pdf
    • https://site-1177298.mozfiles.com/files/1177298/driving_animals_coloring_pages_for_toddlers.pdf
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/tunulid_guwetajadiniri.pdf
    • https://cdn.sqhk.co/zapajugadira/ifjffP7/86746421077.pdf
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/sebat.pdf
    • https://cdn.sqhk.co/riragimi/ieigiji/52252264657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gazivemon/multivariate_data_analysis_7th_edition.pdf
    • https://s3.amazonaws.com/viromibukoleliw/citect_anywhere_android.pdf
    • https://s3.amazonaws.com/pigolo/56921347658.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc38.bin
a87667ca752635af7e45772c3f2c409af543b927bbd6c8e0911bcbbc6786eb7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 5324 bytes
font_01_sfnt_off0000ee24.bin
725e18f149cdb31fd3d71a4efdbf7d58c68870d04ff856de147092051bbb2409
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 10412 bytes