Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea315bcb499c95c4…

MALICIOUS

PDF

83.3 KB Created: 2021-03-28 16:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c40707f38e9754cd182290ce8a0bcdba SHA-1: f907e350f4952eb64dc27e7c4171167c912af293 SHA-256: ea315bcb499c95c402c1e02bf5d68e4cc8e2d9e286704db386cc5133964774eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/123?utm_term=mother+in+law+christmas+gift+guide PDF link annotation
    • https://puxupukesif.weebly.com/uploads/1/3/0/8/130813524/1aa98c.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/gomegemola.pdfIn PDF document text
    • https://punulizi.weebly.com/uploads/1/3/5/9/135957491/2034449.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/bekuzof-kuxipogewumetu-pedenodif.pdfIn PDF document text
    • http://lolkek.xyz/febi_bilstein_katalog029cv.pdfIn PDF document text
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/didikoxujej_jugesedame_garafujenaxe_bejopiwud.pdfIn PDF document text
    • http://playmarket-online.com/dark_souls_3_wikipedia_espaolp6y4p.pdfIn PDF document text
    • https://sadewirezetif.weebly.com/uploads/1/3/4/3/134318623/xovopedododo.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/3284171.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/ed206ed817e.pdfIn PDF document text
    • http://fomejejavegod.sportsontheweb.net/caterpillar_c18_generator_service_manual.pdfIn PDF document text
    • http://confirmationhelpcenter.com/87528958021pbgzo.pdfIn PDF document text
    • http://phillipen.online/is_the_5th_wave_movie_a_series3izzx.pdfIn PDF document text
    • http://texno3ua.com/learn_english_speaking_online_chat_freek655m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_5648cc99c180498cb6691cf3e73915e5.pdf?index=trueIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/biology_class_9_bd.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_4ab523f80a924c9aa86ad51761c346c0.pdf?index=trueIn PDF document text
    • http://wujagenak.atwebpages.com/kagidawefawikosa.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_fd114d06940740dbbb8e9322d1796df7.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_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 5532 bytes
SHA-256: c4a611fcb0c54a569472b43ec20b14a3521f49eec40ba592c7f1a3520674136e
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 11900 bytes
SHA-256: ced4cb97bb402c9edeaf8eb03b1d13c75c2ffb6eccfbc62b8e1b5b23e67fe42c

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