Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa38c22812c8c52…

MALICIOUS

PDF

78.5 KB Created: 2021-04-18 06:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 588f09410dfb47f1066bc74a8e61f442 SHA-1: ea2c95068a0d9535fdb27369bafbeb73666fa580 SHA-256: 0fa38c22812c8c522044d8bfb66ce3491c08c92a0d66fcd6edec1557ec9345fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://soxebez.ru/strik?utm_term=focus+on+life+science+california+grade+7+teacher+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453334/normal_600948245f61b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_6043732d1e478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_604342a1e6525.pdfIn PDF document text
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/8820441.pdfIn PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/pijig-kuremegamow-paleso.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/rotevanafakox-movok-niserapazeliso-sezami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_6003138067f69.pdfIn PDF document text
    • http://mishabelle.ru/casio_exilim_card_ex-s12ablg0.pdfIn PDF document text
    • http://lavka-karamel.ru/jizubipabagujegagohty8i.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/kififovetuduker-luxitasizani-pewezinemakosub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_6063d87d890b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_604251e75cc60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fe7a2ef6b150.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/70102475080rcxjx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_605414a579daf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_60001608ea9ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5feb5e7f93159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5fec9d72233a1.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/rixewozus_zuleb.pdfIn PDF document text
    • http://hisgohar.site/masosulapemijokupebc7lh.pdfIn PDF document text
    • http://damita.fun/pukitemexogcuiy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_aac655075bf142f79d7041219a682abe.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_ce1d1cbe719942afb7d34f76ad0631e6.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_21b237b90c6548dab36f68189ba2a6d0.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_840a49a5d2634c8a8b9f46acc4520350.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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5320 bytes
SHA-256: 9f901b48fa05f3561f173b92455c4137040ebb139ffa969a4682e39f6b442257
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 11848 bytes
SHA-256: e15ede286453ececb4675c58c3d86304983d48ff1bb110cd35cf7216da4057be