Malicious PDF — malware analysis report

Static analysis result for SHA-256 2824cbce99e84f09…

MALICIOUS

PDF

80.2 KB Created: 2021-04-06 00:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 74afb31956443c45a840be186e537afc SHA-1: 601621bfc00dc558e612948062e5498d722986e7 SHA-256: 2824cbce99e84f09dadb3a0ef61391711390128e3f11f9baffa9f06f2939dd7d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://soxebez.ru/123?utm_term=elminage+gothic+class+guide PDF link annotation
    • https://cdn.sqhk.co/temirikuji/clgdjfb/18235046321.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/ifhcdhh/wives_love_your_husband_bible_verse.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/jbMJifk/drill_down_in_excel_without_pivot_table.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/b9dc32e.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/siwep_xejebubekagurub_rekunuzunofi_wivalusepanavus.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/geScgjB/raider_origin_rune_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/jdjajbf/drug_lord_2_game_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_6025ebd9977bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_6036180d11e9f.pdfIn PDF document text
    • https://cdn.sqhk.co/salaseli/cRhgOhj/usability_testing_questions_template.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/j4hjghP/zombie_survival_game_company.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/9706446.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370270/normal_5ffddb981a47b.pdfIn PDF document text
    • https://cdn.sqhk.co/rufetuzek/Qib1iia/snake_in_the_grass_lyrics_murlocs.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/xghQPii/war_tutorial_empires_and_puzzles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fe0fc00cb236.pdfIn PDF document text
    • https://getovutiwezo.weebly.com/uploads/1/3/4/6/134696705/xunowitunoxom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_60527847a79c5.pdfIn PDF document text
    • https://cdn.sqhk.co/magimoruki/eBchdib/rock_and_mineral_show_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/fipiwolewerosib.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/0piayBe/australia_post_mail_redirection_cancellation_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_719d124ba6f345d49a6179a43cf889fe.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_2a8ec55b695f40469765d76e5c7a76f1.pdf?index=trueIn 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_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 5216 bytes
SHA-256: f5ae301fd86c0af980cfbdd9f42346eedd200ee9e9a33dce263d7070a8a33157
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 12488 bytes
SHA-256: d2a5e5d3845b658618df5419efa85b2552143649ed6a0ac30c6019fea0a75aab