Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5cb62685785a5f…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 14:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d6cd94c93260f38165d56034d0bd31ee SHA-1: 043af4827ce8a1cc5288a1945f601cc8cd7e6360 SHA-256: cd5cb62685785a5f286883ec9ed210bb7c4f5dddb66947d50de83188353c1d27
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'mezovuduw.ru', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'meditation for beginners pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://mezovuduw.ru/award?keyword=meditation+for+beginners+pdf PDF link annotation
    • http://thedopemarketing.com/hemoglobin_a1c_to_glucose_chart24yfq.pdfIn PDF document text
    • http://kartaidatodemeleri.com/elementary_statistics_eighth_edition_answersaki04.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/7830658425.pdfIn PDF document text
    • http://vinnipoh.fun/zadanenupojogibofismbvlg.pdfIn PDF document text
    • http://momarivido.mypressonline.com/what_ink_does_hp_8620_use.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_603d270261261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_6038fc97ee3b2.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/feliz_navidad_chords_michael_buble.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5feceab30b86f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5feb7664cd128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_600e6e2d56a3a.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/550acd09-d742-4d17-87e1-81eeccda152d/zidinorisesew.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_cf4bf0308e674020bce45b3be00f0adf.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_2883c59f627d4134bb85d7858de309f9.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_a8faaee00cfa420fbfffcafe46cbbf52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d897e466-568e-4d05-8afd-5fc66191933f/sex_and_the_city_characters_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b408a2-2295-47f9-87dc-b3650cabaf22/maxivirosiwivikepi.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_27de4c7d38c04417a6f849ca44f65423.pdf?index=trueIn PDF document text
    • http://positajugopisu.myartsonline.com/honeywell_chronotherm_iii_to_nest.pdfIn PDF document text
    • http://neketepa.myartsonline.com/complementi_analisi_logica.pdfIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_b3c8e01770cd454cb8e2ea6c1649d6de.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3f56222b1c4e43dc88f358098b2457bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfa26b5-bfde-4cb0-afe2-a6949fccf0ff/gokevada.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_82e426fe01fa4a22afa0d949cf3dd65b.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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 5324 bytes
SHA-256: ff98eedba3b4d6f297cd43111d34698924870bf916607c3fa186409783a943a5
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10692 bytes
SHA-256: 0de8e03ee2341b580faef16dbe3bc5f3037b2023784e47d433fdc935f9ad9db8