Malicious PDF — malware analysis report

Static analysis result for SHA-256 170be24bdd6e42b1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-17 12:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e875e0c7e53d7d7ed9594b62dee608fa SHA-1: c34f2f03da144e65164649881d70ae9e046adacf SHA-256: 170be24bdd6e42b176170a75af22dc7e8754a5275f6af51e84684a58be8703e6
246 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and is specifically flagged for brand-impersonation credential phishing targeting Yahoo. It contains a link farm with numerous external URLs, many of which are hosted on disposable domains or redirectors, suggesting an attempt to obscure the final phishing destination. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its content beyond the metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/a18bd.pdf.
  • 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://resalured.ru/wix?keyword=dune+buggy+250cc+2+seater PDF link annotation
    • http://vanlit.ru/77423584853car8.pdfIn PDF document text
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/a18bd.pdfIn PDF document text
    • http://thelandofbadideas.com/samsung_s4_mini_kontakte_auf_sim_karte_speicherngr7k9.pdfIn PDF document text
    • http://domavera.ru/59645486312q4q80.pdfIn PDF document text
    • http://itdomen.fun/office_dress_up_appa9s4m.pdfIn PDF document text
    • http://lovelyhouse.online/harry_potter_book_four_chapters9c6pn.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/vokoxe-kogukefagunoj.pdfIn PDF document text
    • http://creditactive.info/dezopitobuxudekebuwisodoz5t1e.pdfIn PDF document text
    • http://aycotoro6.xyz/86719822285aj3o4.pdfIn PDF document text
    • https://pemejugaxopuled.weebly.com/uploads/1/3/4/7/134749032/tiwezubinexij.pdfIn PDF document text
    • http://medgaj.com/80563014732n3y8s.pdfIn PDF document text
    • http://servicesforsupport.com/47348207331yr8t0.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/3079506.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/31492852714amzg2.pdfIn PDF document text
    • http://marketop.club/how_to_start_cardio_for_beginnersk1ose.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/59984fa6f26c3.pdfIn PDF document text
    • http://circulshtangcalip.website/fifty_shades_darker_movie_free_download_worldfree4u9glra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_d22c99932eb34ddda6650ec0aa204eb8.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_663b30c17147411c9e2d8e0c3d601971.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_89bbdf8cab984088ad3e4903f39e7a04.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_9e279cdfe6f94277affda93944537864.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_ed3e2615c6664bdfbae13050321abce3.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_93734a44c7284ae5bd17d130e26f149d.pdf?index=trueIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_ae222d1e8df546b4abdbfc4b45ea9e2a.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_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 5576 bytes
SHA-256: 3aa413f1cf00149fa81034157b0c156ce2b4b1693b65332f3bc89d57616a7c5b
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 11652 bytes
SHA-256: 52226804f18c40ad4dddfca5d6004f9cd7e39105eedce2631359476947b1367f

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