Malicious PDF — malware analysis report

Static analysis result for SHA-256 59138d831b2e00bf…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 13:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0ce9aa27bf3c35aaa8a09b587583111d SHA-1: a0716551e4e2ae7222fe24c44f67b942b0dd6cd5 SHA-256: 59138d831b2e00bf528c0bb6663a54b880456b81c8eb0d4d047456806bf93db4
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 and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=what+is+shop+drawings+in+construction PDF link annotation
    • http://repair-foto.ru/42282067177hmden.pdfIn PDF document text
    • http://storergoods.site/depukisanalumewodivuw4xc3u.pdfIn PDF document text
    • http://ideal-it.fun/vuzafapuzulmkbaq.pdfIn PDF document text
    • http://kompledom.com/85833698612kziyp.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/bar_chimes_sound_effect_freetoei3.pdfIn PDF document text
    • http://datinge.site/what_is_the_book_the_magic_mountain_about7h4x1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_6039d8e6230b5.pdfIn PDF document text
    • http://foyou.store/nutamzgyez.pdfIn PDF document text
    • http://simcars.ru/baby_boer_goats_for_sale_in_ohiou8x11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_6045eea1c6644.pdfIn PDF document text
    • http://thelandofbadideas.com/how_to_install_hp_officejet_6000_wireless_printer_without_cdcb897.pdfIn PDF document text
    • http://liketime.fun/lesidokutefomogagazusobkxfy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5fcd667c57797.pdfIn PDF document text
    • http://localdesign.me/usb_c_audio_interface_androidei7id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_603564d91079a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_601ed7601ff8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_b14f57f0dbce4eaa839ffa3c1ba78907.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b57d670-e3c9-4fcc-8500-501938920ef2/25358961859.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_2d660fad9971445fbab60f71bff358c0.pdf?index=trueIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_ee2361ab418f4615bc59283b18532345.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4861ab-0153-4663-a0c4-86ae02afd497/coleman_powermate_pulse_1850_oil_capacity.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_af44cd671e4c432da91daeed105316d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/773431c9-3a87-457f-a506-7a4222296a2b/vitamix_food_processor_attachment_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ca6535-8d96-4a20-a6db-281ec0c8f475/how_to_put_ps4_gold_headset_in_pairing_mode.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_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 5408 bytes
SHA-256: 7683e20a3a5b14bfba9f49750f6a52bba9292e8cb583de50843062445d720928
font_01_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 10956 bytes
SHA-256: 1e9adbe08b9ad7fab48036f74b4668a18eb1890619f6818030d1bc59c786bf52