Malicious PDF — malware analysis report

Static analysis result for SHA-256 d548fb8eaed6cfa8…

MALICIOUS

PDF

85.9 KB Created: 2021-05-08 09:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3d287ff3396cae69253fb014a3cbf067 SHA-1: 70da13906b89e7e1a3e844689cff02424386d601 SHA-256: d548fb8eaed6cfa8d6184be2cd245584b11343244831b81f5d781368cab49110
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('midufefew.ru') that appears to be part of a link farm designed to redirect users. The presence of multiple disposable domains and link farm heuristics suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/strik?utm_term=powerflex+753+ac+drive+manual PDF link annotation
    • https://cdn.sqhk.co/dokukavifig/bKn9kgA/1979_revolution_black_friday_ps4_trophies.pdfIn PDF document text
    • http://mon-cmbretagne.best/10408156237ve0op.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/samumaxakuvadijirugur.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/91276268266.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/gi9hdic/76710238066.pdfIn PDF document text
    • http://frukt.space/montblanc_little_prince_rollerballptx0h.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/54005214298.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/gomabotup.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/USjhjgl/47701938208.pdfIn PDF document text
    • http://uaportal.site/how_much_does_it_cost_to_get_osha_10_certifiedem7rb.pdfIn PDF document text
    • http://fapinudonas.22web.org/american_red_cross_summer_youth_volunteer_program.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/2ktnhcv/63631603383.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/english_vocabulary_words_with_meaning_in_arabic.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/ied27Rm/3237_viridian_point_colorado_springs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvuxurim.epizy.com/zenijumabalubafu.pdfIn PDF document text
    • http://safonakidu.rf.gd/mobelesadig.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/rawuzijiv.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/boiled_egg_diet_plan.pdfIn PDF document text
    • http://sobavetugobi.epizy.com/alice_in_wonderland_novel.pdfIn PDF document text
    • http://rudozanel.epizy.com/66452304437.pdfIn PDF document text
    • http://tekisinasapev.epizy.com/davigofegabuseniwuzod.pdfIn PDF document text
    • http://piretiwojof.epizy.com/rowenta_steam_care_iron_dw3191.pdfIn PDF document text
    • http://lojarine.epizy.com/723601245.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_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 5576 bytes
SHA-256: 354bc872d9112225b94dd06b8d267b65f8d897d2f5035415a8df3a044671f6b4
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 11728 bytes
SHA-256: 3bba64eef61e6a163526a92e348c50f84789acfbce12844ca2806b53f8a6c229

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