Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7077043e9be76f…

MALICIOUS

PDF

72.4 KB Created: 2021-03-11 03:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b5deffc1f4f48cca42535b0df4a1894d SHA-1: 2a088c5ce1a36450a5b66709767f933dd8518624 SHA-256: af7077043e9be76f6b6db9807c992416b35c1a7fa9efc4e49b919f2a235902a2
184 Risk Score

Malware Insights

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

The file is a PDF containing embedded links that redirect to known malicious infrastructure. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The embedded links, such as 'https://crophysi.ru/award?keyword=barbara+cartland+pdf+download', are designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=barbara+cartland+pdf+download In PDF document text
    • http://vamolufu.getenjoyment.net/45126977342.pdfIn PDF document text
    • http://hookup754.fun/where_is_the_nearest_seventh_day_adventist_churchvajs6.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/51889494149.pdfIn PDF document text
    • http://okstore.info/alpha_teken_word_maci5gak.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/jjihfpz/9852748199.pdfIn PDF document text
    • http://filemarker.store/56541454587pmudu.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/ielts_band_9_vocabulary_secrets_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/kDyghih/xeximokigufapuvosot.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/rarebixovinuraba.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/how_to_remove_the_quick-connect_sprayer_hose_on_a_pfister_faucet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_12498177268d41ea94f914def609c75a.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_67ad54f52c314b12933a24505ff015d8.pdf?index=trueIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_b7d77f44542548a8bdaa021856189e46.pdf?index=trueIn PDF document text
    • http://tuparibuju.atwebpages.com/headway_beginner_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d61ea4-6674-4c44-97da-4c452dcf76d2/lufivokavuxawiladaxexivi.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/monarquia_absoluta_caracteristicas.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/what_is_the_best_food_saver_vacuum_sealer_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331df085-83c9-43aa-b25d-45ee9e41d376/how_to_connect_ipega_9076_to_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f0a1f6-e5bc-4a1d-8980-28ece8c416ab/xfinity_remote_code_for_sony_bravia_tv.pdfIn 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_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5252 bytes
SHA-256: 0380a7499953a3db0c596c92a511b3ef2fa13a4e88c118eb9a7c85a8e8fdafcc
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 10228 bytes
SHA-256: 10936d3698883c799418c6f79b7522bba6bb5223d36bc58723c32c56efde3d5e

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