Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84973fa60bd68c8…

MALICIOUS

PDF

82.2 KB Created: 2021-04-28 06:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2c7060626ea7c1ac009a112237c95ae5 SHA-1: 2c76143ecaf6c97b61dc7fa4f1689a3ffd154609 SHA-256: b84973fa60bd68c881fb16942a6025dc8852af4311cd8baf802ac48946ddabaa
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/strik?utm_term=how+to+hold+ice+axe PDF link annotation
    • http://wusator.mygamesonline.org/43782270542.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/cover_letter_for_job_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_6066924e7d6b8.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/academic_word_list_570.pdfIn PDF document text
    • http://hookup157.site/441149817347r9uq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fffb36497149.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/ecological_succession_worksheet_answers.pdfIn PDF document text
    • http://kprovk.xyz/most_common_chinese_male_names2bnh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404976/normal_5ff60bae3a517.pdfIn PDF document text
    • http://jaxixojuko.mypressonline.com/winnie_the_pooh_chapter_2.pdfIn PDF document text
    • http://jilet1.club/erasmus_programme_guidehooro.pdfIn PDF document text
    • http://blockhcain.host/samsung_hm1350_bluetooth_headset_manualowc3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zavalexudar.epizy.com/scratch_ile_arduino_kodlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3796940-f0f8-418d-9c83-66b3d2e3bc00/68260460648.pdfIn PDF document text
    • http://wiratobut.rf.gd/irish_bouzouki_chords_gdad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4e507a-352f-4888-9466-41c8bfe15b38/what_is_an_example_of_specific_deterrence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a421ccd-34ee-410b-a46f-d5fca4710775/when_does_power_book_2_ghost_come_on.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/46702041671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0520c436-ac46-4142-8625-87001d4f78db/98780574357.pdfIn PDF document text
    • http://rofamotitasijud.rf.gd/wonder_woman_movie_in_telugu_dubbed.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_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 4872 bytes
SHA-256: 2f243e2af8f639029edf8ba4725f9ecf16d534ed4994425f1029cb2756d3bda8
font_01_sfnt_off000115b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 11244 bytes
SHA-256: c9c21f8085c0239c272a8714a1b30eda65f0789f2a631833f9af9e0d808cb293

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