Malicious PDF — malware analysis report

Static analysis result for SHA-256 86511e098a2ee67f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 17:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0dab4bdd4382cad948fb981bec821ca6 SHA-1: d8ba562af8b10b7b47f0e6214d29b206648f4d55 SHA-256: 86511e098a2ee67f4e0431ed30928424c8577a7efdb6edb06b02c71f094d131f
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, with one pointing to a suspicious domain 'midufefew.ru'. While no scripts were explicitly extracted, the nature of the PDF and the embedded links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=physiology+of+the+circulatory+system+lab PDF link annotation
    • https://vatifogogunubit.weebly.com/uploads/1/3/4/7/134725392/6833230.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/14850398457.pdfIn PDF document text
    • https://guwixuwekolarap.weebly.com/uploads/1/3/2/7/132740580/vononujosofexiw.pdfIn PDF document text
    • https://kufobuzu.weebly.com/uploads/1/3/5/3/135330794/5180710.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/fafigufi.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/sulolito.pdfIn PDF document text
    • http://tuwedoviwe.iblogger.org/on_average_how_much_does_a_new_furnace_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dupula/are_harry_potter_books_better_than_movies_reddit.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/24854377094.pdfIn PDF document text
    • http://datavofunuta.epizy.com/does_a_w_on_your_transcript_look_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/piano_sheet_music_treble_clef.pdfIn PDF document text
    • http://bigamutalunu.atwebpages.com/interior_design_magazine_free_download.pdfIn PDF document text
    • http://pewazeje.rf.gd/93942528167.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/apocalpticos_e_integrados.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/17006148586.pdfIn PDF document text
    • http://goxojerodumofag.epizy.com/kewavaziji.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/jeboduxod.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_2417a2f4372d48c0aa5888c49b685e85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geradi/42291188803.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/pursuit_of_god_aw_tozer_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/tafixobobi.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_6b77f2125a1648e9815874093a620a84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/benanomizanuzaga.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/what_is_national_news_agency.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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 5536 bytes
SHA-256: 8ef332ef1462baac5ea794e5ebabaa6dc152d883588e051744cab467642c8bf2
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 11704 bytes
SHA-256: 6751bc0bc02c50f2ae191fdbc5ea1be8855a9169a2d2b3cfd8d78b4fdc1487ca

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