Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd980c7dca65c2ee…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 21:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a0f6a4af672f13a64e8c844c4551c072 SHA-1: d531794cca179de05c1ad96f7b9e8fd2f2739b43 SHA-256: fd980c7dca65c2eedd15508921097fe8b3e398f7f06fad9a734779e075821fd7
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 embedded URLs, many pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term=excel+vba+inputbox+parameters' in one URL indicates a potential lure related to Excel VBA, although no VBA scripts were extracted. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=excel+vba+inputbox+parameters PDF link annotation
    • https://cdn.sqhk.co/gexedamej/hcMhfig/85492115004.pdfIn PDF document text
    • http://apsdd54gfv.xyz/39389711931iicji.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/jigchaq/pizzaiolo_pizza_sauce_recipe.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/1fe6e726a9cc414.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/nifitodugu.pdfIn PDF document text
    • http://ezfix.asia/centre_de_formation_professionnelle_calixa-_lavalle_montralav51b.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/gftFM5F/futenumexoziwos.pdfIn PDF document text
    • https://cdn.sqhk.co/lupananonutu/bjge5gc/32992329644.pdfIn PDF document text
    • https://visorupa.weebly.com/uploads/1/3/5/3/135305290/pesuxuno_gokibafu_zewefem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexalovujomorox.epizy.com/26544273972.pdfIn PDF document text
    • http://nugagopi.epizy.com/the_tempest_book.pdfIn PDF document text
    • http://jevazebi.epizy.com/internet_cafe_simulator_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/best_mini_gps_tracker_device.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/27576619899.pdfIn PDF document text
    • http://pidivatepijalaw.epizy.com/ladededitanug.pdfIn PDF document text
    • http://kuxetelib.epizy.com/dojivusabulisamapub.pdfIn PDF document text
    • http://gimezevu.epizy.com/vevedufusawotebanumebeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/89916164728.pdfIn PDF document text
    • http://xiditad.rf.gd/gasizuku.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_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 5304 bytes
SHA-256: 55a4826145898855c4a5ebe9f9b12243c35e42f1c74f47542b5cd15cecdcee8e
font_01_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 11480 bytes
SHA-256: 44f1b6b39dffb78253984e6b5934afdcc4daddee81650cddd53ecafb013c9603

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