Malicious PDF — malware analysis report

Static analysis result for SHA-256 764f836fd55e6b62…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 23:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d7b7754a29918ab4380202b8861d3aba SHA-1: 22223885a7febc7e020ea702efe7962fb2a907ae SHA-256: 764f836fd55e6b6233dd92796b0a2204127ff8f36c59c7c0f6103fbe3d467ade
186 Risk Score

Malware Insights

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

The PDF contains numerous 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 phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=pobre+ana+pdf+in+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5fcc7d43715af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458428/normal_60070ba09ab4d.pdfIn PDF document text
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/mitisolo.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/d072483c8939dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_6032da6d6fd22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_604cfbca22c5e.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/bible_interpretation_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_60088aab74bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601e05beb43da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388421/normal_5fe50c5ad47be.pdfIn PDF document text
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/parusokarovur.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/gadamesag_lazuzelorabak_newurepiro_zurefofapivux.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/paluzagusatevezumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410674/normal_6002c78793afe.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/6398ca0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_c1f465a292ea4faba07fe767d11bbcf0.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/in_the_heat_of_the_night_book_setting.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_ffad50b9a54d42b6a04c28d3dea5dac4.pdf?index=trueIn PDF document text
    • http://tuzuxutetug.atwebpages.com/rokavavi.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_0a4804ee4fcf4c558ef9f0972aff12eb.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_a6ab5f5167834eb181db537642f6eba9.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_14e4d1f56be84e8f9e72c139a008512b.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_e1106ff1fb7d46b3844194e4e619235c.pdf?index=trueIn PDF document text
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_5188d764984740c5a8158b604abf79fc.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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 5444 bytes
SHA-256: be7a1a539cdf17234cc018c698a0b91156275d88651c00a626eb10ed9f1e8054
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11204 bytes
SHA-256: 6f3f61ba1a142474730074681db80da4d8448e0bd59e8aee018fd768338ac254