Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc77fa3c5e7dbda…

MALICIOUS

PDF

75.0 KB Created: 2021-04-05 00:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b1370762e0347205d7fdced0b903141 SHA-1: 9a72d90b05c47084d9a829c685f9a0b7cddbb4ae SHA-256: 1fc77fa3c5e7dbda5239419cce7cda74f507ff88fbf1634928344fe0eb221c81
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the content attempts to mimic financial instructions, a common phishing tactic. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to exploit users by directing them to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://jottigo.ru/award?keyword=society+bye+laws+2020+in+english+pdf PDF link annotation
    • https://cdn.sqhk.co/pisapaxosabo/jxPhih6/71146555721.pdfIn PDF document text
    • https://xegezutiraviral.weebly.com/uploads/1/3/0/7/130775125/e559159c218.pdfIn PDF document text
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/528608b443f.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/vovalikam.pdfIn PDF document text
    • http://secret-empire.ru/cosmic_frontline_ar_testry6a2.pdfIn PDF document text
    • http://kodutizaga.mywebcommunity.org/biomathematics_notes.pdfIn PDF document text
    • http://hookup154.fun/kudarjagph.pdfIn PDF document text
    • http://biolinkus.me/935501958161rcyj.pdfIn PDF document text
    • http://gnfcns.info/meme_sheet_music_saxophoneq2pia.pdfIn PDF document text
    • http://drovazvenigorod.ru/naruto_blazing_hack_apk_2._11._0iy3fv.pdfIn PDF document text
    • https://gasezojilatinoj.weebly.com/uploads/1/3/1/4/131455825/gekuta_jaramolokulufon_terijifixol_makezamizuk.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/badomonaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/jjb6ZeA/7772534163.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/157a71f3-4b59-4ee5-9c27-8479b6d94554/soneto_clxvi_resumen.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_45964b5f8cb343cd9c033baabbeee112.pdf?index=trueIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_53364cb4911e4b4090c9b4ce75fc3dda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5a3d64-10eb-47d2-9dcb-ad45faacf839/algebra_nation_answer_key_section_3_topic_1.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_16492b97ea2a4971922bc152ecfc782b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf06ba43-5f2e-4b8a-b172-f62aa9b2644c/spoon_river_speedway_2020_schedule.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/oxford_school_atlas_map_book_download.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_c8ea1f20dfa040db8b5c558a66d73149.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffe47aa-35e2-4df9-bdc4-bf82d10442a4/lobebibimekulajefumexu.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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 6032 bytes
SHA-256: 39b68a3181f83187a1e2ed18b002bf44e5cdda1ce36b6ff007b08812f65f08a6
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10424 bytes
SHA-256: f6fa12efd2b8265dccd5c501e9dd48aa6b5dfdf6d20c22e8b5cf679e72ff468b

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