Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf4880acda938ef…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 07:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1ac9449a7f7b022591c4a25d7c1067c SHA-1: 208980bb215a0ef460e302a4a8b0a2b835000653 SHA-256: 5bf4880acda938efc5ba6823d45008ce61a0be27c6191d44362a21729e46543b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely leveraging a PDF exploit or social engineering.

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://jacksth.ru/strik?utm_term=lg+hbs+700+headphones+reset PDF link annotation
    • https://cdn.sqhk.co/fepogosu/0aQS3We/72019224370.pdfIn PDF document text
    • http://ru-en.xyz/pe_power_exam_formula_sheet416kf.pdfIn PDF document text
    • http://vekvelo.ru/kadoxidolite496cg.pdfIn PDF document text
    • http://fuckfrsky.com/264165485795sqlh.pdfIn PDF document text
    • http://tiktoktop.design/xosonedapaxivi29zw5.pdfIn PDF document text
    • http://zumbayuliya.online/will_2020_be_a_good_time_to_buy_a_housezxxdw.pdfIn PDF document text
    • http://wellwork.site/sitetekuwisulazokasipedz8oxd.pdfIn PDF document text
    • http://reduslim-buy.site/lojomasekuselugowizerqhk2.pdfIn PDF document text
    • http://italia-doc.fun/list_four_components_of_unconditional_positive_regardxl4br.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/aQbQieC/bomow.pdfIn PDF document text
    • http://vorecan.space/sixubadepinumezulsfaf8.pdfIn PDF document text
    • http://testersairf.xyz/regional_anesthesia_books_freeebn7x.pdfIn PDF document text
    • https://cdn.sqhk.co/janogoxuke/uijchaD/guess_the_25_movies_in_one_picture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namavorudil.epizy.com/lux_aeterna_sheet_music.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_70c8d5066938406fac025e3cd43ae443.pdf?index=trueIn PDF document text
    • http://jafuzoteneg.epizy.com/39345550320.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/alesana_songs_free.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_dd0cfba7d040437bb57674acfe3e67d2.pdf?index=trueIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_74651223e62b4a098c401ea919b4204b.pdf?index=trueIn 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_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 5492 bytes
SHA-256: 8050b762f6c54968c11a632f7b2c9c6ec213fca1462498df45bb89b83ff68abf
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10380 bytes
SHA-256: 519292551e70a7d36ab174693a2d499d435cd15a33ff06292e15c2c5ea7a6b0d

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