Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a861e217212c2c…

MALICIOUS

PDF

98.3 KB Created: 2021-04-10 09:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b92a961f11cbea3d5df0f85cd116ee2b SHA-1: 230189ad5848d1aa4a279ff9851282a4c1eb9adc SHA-256: 48a861e217212c2c24621afec123e384a4026bcaebae9644e46613627fa39677
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to product searches, reinforcing the lure for a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=vicks+starry+night+humidifier+filter+walgreens
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/7b83cece5155.pdf
    • https://tofigota.weebly.com/uploads/1/3/0/7/130775321/xatepiw_febivala_zubogupazuzeni.pdf
    • https://cdn-cms.f-static.net/uploads/4374207/normal_604635460dc87.pdf
    • https://cdn-cms.f-static.net/uploads/4376866/normal_605f5338cff95.pdf
    • http://jokixulu.iblogger.org/create_chart_from_multiple_sheets_excel.pdf
    • https://cdn-cms.f-static.net/uploads/4392659/normal_6048dff460f24.pdf
    • http://tipines.iblogger.org/91843114237.pdf
    • https://mojilizide.weebly.com/uploads/1/3/1/8/131857690/xosinefedotor-jamumejak-vofimiberefu-bimelebemitil.pdf
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/niwoj.pdf
    • http://vemololuwejab.iblogger.org/metal_melting_points.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pukadevimetuz.rf.gd/c_form_in_hotel.pdf
    • https://uploads.strikinglycdn.com/files/fa3c3efb-5f9c-4ab1-948b-b9ef5a82909d/woodchuck_hyroller_1200_parts.pdf
    • http://siwojanapav.epizy.com/detuvab.pdf
    • https://uploads.strikinglycdn.com/files/819e9149-344f-42b9-b53b-71a11f756e55/wewabonaxidirefo.pdf
    • http://nebugobebakejef.rf.gd/the_crystal_healing_bible.pdf
    • http://tewederukafolez.rf.gd/sat_subject_test_books_amazon.pdf
    • http://fekidet.rf.gd/ipod_nano_6th_generation_charging_problems.pdf
    • http://nurejorafu.epizy.com/78531766347.pdf
    • http://demunoj.epizy.com/lease_agreement_example_template.pdf
    • http://duvufewitopemaw.rf.gd/ragnarok_eternal_love_premium_guide.pdf
    • https://uploads.strikinglycdn.com/files/9930faa6-2be8-4227-961a-f7ace4905caf/6757940389.pdf
    • http://kinugokapa.rf.gd/fegoledaribunafewewaj.pdf
    • http://dujabonesisu.rf.gd/free_simple_project_timeline_template_powerpoint.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f61.bin
7767b8141484ad5b47728a209bacc8ba364d932a9d9a04b1b97123c4737cbe1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 5656 bytes
font_01_sfnt_off00015293.bin
43cf27690337bab06ffcacb2f9f0e56ffd55d11a98a4834c4c7d5e0cff37036a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15293 12156 bytes

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