Malicious PDF — malware analysis report

Static analysis result for SHA-256 524b724f7276ea1b…

MALICIOUS

PDF

82.2 KB Created: 2021-04-18 21:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d667e9e48dccb76d78ec888ae0d9dfb SHA-1: f7dd20c053a141157d4f4049520a18eab1bf8c57 SHA-256: 524b724f7276ea1b9aaaff3f3435099b8dc9312c3fd0354f65e8cae50310a1a1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL is https://fokemale.ru/strik?utm_term=asus+p8z77-v+lx+overclocking+3770k, which likely serves as a lure or initial redirection point. The PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=asus+p8z77-v+lx+overclocking+3770k PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471249/normal_604d942d446aa.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/74628470925ri42m.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/ehedhiS/lidonil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_602afde66819b.pdfIn PDF document text
    • http://prostotit.site/fidemisuvozuviu5prw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_60621daa9b0d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_60678c0815187.pdfIn PDF document text
    • http://odemebayisitrafik.com/mekolutopijarse66m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fca5c6f35f05.pdfIn PDF document text
    • http://world-wild-shop.com/30576753929wtpux.pdfIn PDF document text
    • http://magnetfix.store/pakistan_studies_book_for_bsc_in_englishcnff7.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/a1geSYs/7221888145.pdfIn PDF document text
    • http://wonder-ita.fun/69308996395c45zs.pdfIn PDF document text
    • http://rukozhop-guide.com/geometric_and_arithmetic_sequence_worksheetvd6w5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_1e9344eb65be44b683806bea8db146d6.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_f28de16c1c57494eb8acb5f12ea2fab6.pdf?index=trueIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_0ce1f0b91faf4fbc95af8e2bb861beef.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_443bdde2b5e14e489a77d1946af1512e.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_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 5732 bytes
SHA-256: 364f65b4fca1cbff084bc716534d02c689675ac9a0c0191196ef01f09508509c
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 11848 bytes
SHA-256: a7f76e50182454c551879e8446bf587dda4e68c3f77be26b312608fcf4bb9297

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