Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6be8b81b255b898…

MALICIOUS

PDF

75.0 KB Created: 2021-03-04 05:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 055e81870fd3baf66fb3f7086746e819 SHA-1: acb9d60b74b219e7002ac497a823308fc5a144d6 SHA-256: f6be8b81b255b898e7beb2989639fcebf958eb122288f161ce761d4e66b9fb71
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to job earnings, directing users to click on embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=how+much+do+airplane+mechanics+make+an+hour PDF link annotation
    • https://cdn.sqhk.co/gapebeve/e8NMrgg/harris_jail_labor.pdfIn PDF document text
    • http://wagugekewa.22web.org/aa_mirror_android_auto_app.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/tevowore_jukonuxi_guzisizogiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_5fd7ec8349c8c.pdfIn PDF document text
    • http://zakilifawurafed.22web.org/33608226689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_600b05fe3cdb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5fe22972d7bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_601b806d57b01.pdfIn PDF document text
    • http://togezapavux.iblogger.org/avast_cleanup_premium_key_android.pdfIn PDF document text
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/7273080.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/8927157fa.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ji3rige/arcade_donkey_kong_junior.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bukinajomo.epizy.com/56985594130.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/international_marketing_manager_salary.pdfIn PDF document text
    • http://tenowuwewid.epizy.com/xepumosebodimurujobuf.pdfIn PDF document text
    • http://vemewef.rf.gd/meveretisevemopifilafefes.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/abdellah_taia_gratuit.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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5428 bytes
SHA-256: a2a3b0219ad37e460d2e5900bc495462152a052ff81ef4f48d4e61686fa3c3a1
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10336 bytes
SHA-256: c0323498b7cdf1bbecc16ed195cfc9dc209f489092bfc10589968cafe5eb1511

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