Malicious PDF — malware analysis report

Static analysis result for SHA-256 c663cc253a22a5a3…

MALICIOUS

PDF

80.3 KB Created: 2021-05-13 04:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1dc20d2f3f85224a621ff994fbde698 SHA-1: da572effa1890decef05512e0278780a736c1369 SHA-256: c663cc253a22a5a39ec29c4d60f4a04153ce0e19b784426e05aa31a54f8558a7
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, indicating a link farm designed to direct users to potentially malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary URL, https://botokaw.ru/strik?utm_term=team+leader+housekeeping+job+description, suggests a phishing lure related to job descriptions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=team+leader+housekeeping+job+description
    • https://xibagepop.weebly.com/uploads/1/3/1/4/131438114/6715c8c.pdf
    • https://funemozivadomuz.weebly.com/uploads/1/3/1/3/131398429/9975342.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602d6dc5a861f.pdf
    • http://about-fb-support.com/manual_de_entomologia_agricola_comprar7pemb.pdf
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/defomul_dojazite_pozen.pdf
    • http://meetchambre.xyz/what_is_the_name_of_the_man_who_was_vice_president_of_the_republic_of_texas_quizletp8znu.pdf
    • https://cdn-cms.f-static.net/uploads/4424364/normal_6067ca10ac94b.pdf
    • http://itgermany.net/clasificacion_de_funciones_constante_ejemplosmkmuy.pdf
    • http://solent.bar/axe_vs_old_spice_hair_paste7o4a9.pdf
    • https://vobubivozabu.weebly.com/uploads/1/3/4/3/134320693/bifojiveniwenu.pdf
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/6e559e6d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_9acae4567c4b4acfab28a2485604f087.pdf?index=true
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_2acdae836841446bbe6e69ed2ecd67f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a23e285-5cde-4d18-a604-9f5e5b8ac380/strongs_concordance_1118.pdf
    • https://uploads.strikinglycdn.com/files/9d9fa2da-95aa-4e8a-b1f2-8459eb51c357/57837252814.pdf
    • https://uploads.strikinglycdn.com/files/0b0bf341-b6cc-4109-89d2-3e9a648bee78/59064943610.pdf
    • https://uploads.strikinglycdn.com/files/cf58845f-fa09-4327-93e8-c9ec02914bbd/husqvarna_445_oil_pump_adjustment.pdf
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_a9d48c17c6ab4329ab7b02e33a9607ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6fc699c-f6f8-4f7b-92c6-90b02d133945/14533210523.pdf
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_c7d16cbc85a44926820041be49fe50f9.pdf?index=true
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_82ce70fdcbbc44d38190fb8c4992e1bc.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27f.bin
717092d5dd59c8c49ea36c83d21618a51de6d98202d26afd0df3526fbfe5f645
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 2856 bytes
font_01_sfnt_off0000fca8.bin
158f25bbbfb93e5dd76029a64f39f63648dec911abd26be6affcfbe2e67b444c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 5716 bytes
font_02_sfnt_off00010fec.bin
bed7e0a7051f50c55f76f22e8adee565bbd0a4597f895de3342eba6b3f4370f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 10248 bytes