Malicious PDF — malware analysis report

Static analysis result for SHA-256 63116f3b93169386…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 01:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 573df24e907c1bd2dc78540fdc0c6a12 SHA-1: 90dc67188c542c255d3b303e7f3121387be9433a SHA-256: 63116f3b93169386653539276191a889de76be9ddebf03dcba89f19fc53bf4a4
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=fundamentals+of+cyber+security+pdf PDF link annotation
    • http://vejobazure.22web.org/wetele.pdfIn PDF document text
    • http://piredvizhnik.com/bufegokipimelesawudutt2fm.pdfIn PDF document text
    • https://votamonaf.weebly.com/uploads/1/3/1/4/131452952/bd0b7408.pdfIn PDF document text
    • http://amaryllis.space/60834273121p203i.pdfIn PDF document text
    • http://nugitesa.iblogger.org/algae_biodiesel_production_process.pdfIn PDF document text
    • http://jojalipubawil.22web.org/93761555134.pdfIn PDF document text
    • http://zipujesilan.22web.org/xibivavi.pdfIn PDF document text
    • https://wuwonerosetopux.weebly.com/uploads/1/3/1/6/131606808/sozudozuvuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/73208394785.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/spanish_grammar_eric_v_greenfield.pdfIn PDF document text
    • http://wizerojagapez.rf.gd/7062243317.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/84706315266.pdfIn PDF document text
    • http://fofifalog.rf.gd/xuvutimojawidajewote.pdfIn PDF document text
    • http://kevisokifo.rf.gd/52307713751.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/81641302589.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_ad0ffee2329a4648942eb006e8388342.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_6c6bd1e94617449cb6961f24a6af21cb.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_c918344a96984bfb8a40e65315b16dcc.pdf?index=trueIn PDF document text
    • http://rojapaj.epizy.com/37781906568.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/argon_18_e118_manual.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_15ca4dae342749969902b309bc26d58e.pdf?index=trueIn PDF document text
    • https://b4a3f2a4-2f34-4203-9133-4607a2e00ae8.filesusr.com/ugd/84a5c6_512fe5da9d36401d81dbba6242dd754d.pdf?index=trueIn PDF document text
    • http://rivebop.epizy.com/angie_tribeca_season_4_episode_guide.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_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5496 bytes
SHA-256: 9845f45bdf1c6413d56ef8792c5fc0f7d58ef152d689fcfdb3bbd7252d436add
font_01_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 12072 bytes
SHA-256: cbfb3541327a3baf5d9e5f16f6dd97bfc42e3522e9990e08043f6245eb2869bc

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