Malicious PDF — malware analysis report

Static analysis result for SHA-256 5025fbdd9e539168…

MALICIOUS

PDF

78.2 KB Created: 2021-05-02 16:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a9ae8a1ec33a94b02836ff884c5baa3e SHA-1: d445dc5dd6449e1bd35617d51c7e7d55ce6faa49 SHA-256: 5025fbdd9e53916895020cb251f6f96099db778e6b35f25807aa113110d5405a
226 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which are invisible and point to disposable hosting domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/strik?utm_term=introduction+to+law+and+the+legal+system+pdf PDF link annotation
    • https://dizorewumuzesab.weebly.com/uploads/1/3/4/0/134012942/8304285.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/7060292.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/cp6aSgX/jump_start_car_battery_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/bukevexej/fmjjhd9/rusty_blower_3d_levels.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/pazokakug-tetuz-pejixas-lifejizes.pdfIn PDF document text
    • http://temppicture.xyz/74374225913srepy.pdfIn PDF document text
    • http://e-devletodeme.net/topatejowipaxojixigigebh8d8f.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/jfjgjh7/ludo_online_game_win_cash.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/zaxodefare.pdfIn PDF document text
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/tamulakixezugepamewa.pdfIn PDF document text
    • http://bellissimo.online/rojosojofudemuxro6b.pdfIn PDF document text
    • http://com-login8.xyz/nitasalalovxzith.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/guided_pathways_four_pillars.pdfIn PDF document text
    • https://bee08bb6-d8c1-4cc5-89f0-d6ac88a4f64a.filesusr.com/ugd/8b8a1f_381d07a8ccf941ada1ae3566b267889c.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_aaeef781da2148468e98bc07c9757bb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/vanity_fair_outlet_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/2773292540.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/netcut_pro_apk_tanpa_root.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_fa3ed19e38aa418f81c3f295b8cd330e.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_5f0b0425241f48d8bf9052e8df5b4f1c.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_bfec89d6087b4a2093a0705e3379857a.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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 5700 bytes
SHA-256: f97692f933157f3ae18c5f76e3fef0778e2e68f9495b7448dff965a98b154ac1
font_01_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 10856 bytes
SHA-256: 9b2c05f4f819309fe78c20c53e3b4ec09695582fd16508042d06837b4f988ee7