Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6785fc4fe9304b…

MALICIOUS

PDF

66.2 KB Created: 2021-01-23 12:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 70737f488a121a7e8ecb4c1a65ec698e SHA-1: 714244418f7077039c54662fa93eac440219f646 SHA-256: ee6785fc4fe9304b1564b77429078b090e8983b4c91620a05acbb144344f904c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=the+necklace+figurative+language+worksheet+answers PDF link annotation
    • https://site-1168117.mozfiles.com/files/1168117/best_baby_skin_products_for_newborns.pdfIn PDF document text
    • https://site-1253492.mozfiles.com/files/1253492/sukaniwebetuxugivem.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/pewifawarinud.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/gir7Ghh/28600273752.pdfIn PDF document text
    • https://susominen.weebly.com/uploads/1/3/4/7/134714937/c077ec2.pdfIn PDF document text
    • https://balexasureg.weebly.com/uploads/1/3/0/8/130874281/zavosa.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/cjuPgcJ/1492111276.pdfIn PDF document text
    • https://site-1166657.mozfiles.com/files/1166657/91717293358.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/online_marksheet_correction_cbse_board.pdfIn PDF document text
    • http://numusuri.22web.org/bsc_magazine_july_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/eFgcgg8/menunizuna.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jgdjgu1/popular_english_songs_free_download_320kbps.pdfIn PDF document text
    • https://dekewojevor.weebly.com/uploads/1/3/4/1/134132084/4150342.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/ggSygcz/41901164264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fatixoromagik.epizy.com/20250987226.pdfIn PDF document text
    • http://sugizujesel.epizy.com/kemopekimefusorenofez.pdfIn PDF document text
    • http://soburuwukipo.epizy.com/smd_diode_datasheet.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_off0000c7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 5308 bytes
SHA-256: abc7efde0ae9362bcae17639d0edde0e95e53e59996713f9e9953f295e03f9af
font_01_sfnt_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 9696 bytes
SHA-256: 7657393e3cde85097cdf42620f4c62b087a91fb4cd5845730c3e7a9df6041afd

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