Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffb77e3425398d2…

MALICIOUS

PDF

75.0 KB Created: 2021-02-21 19:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e23f87532a328441f1aedda5da873360 SHA-1: c4398900c11b6f5815c1dfeec7035f6b9da2ac2c SHA-256: fffb77e3425398d24d6bc3573dfbb1b07afd94541c59104549314b5f6ddbc5ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=sterling+cutlass+vs+squier+strat PDF link annotation
    • http://canonsburglake.com/revazatadonupepazgysb.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/pgfggvr/welcome_to_moreytown_mod.pdfIn PDF document text
    • http://qunit.space/97306230250tce1h.pdfIn PDF document text
    • http://ampinternational.org/analytical_writing_gmat_format12w9q.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/gijaKRK/62724284175.pdfIn PDF document text
    • http://padlamadla.site/oral_bioavailabilityj2tzt.pdfIn PDF document text
    • http://italy50wow.pro/jirajiweqcl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fca90b261507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415326/normal_60003a23b6389.pdfIn PDF document text
    • http://m-laskin.ru/988835299846p2u7.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/Zvhchgd/donerexizuxobisarutoj.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/uijjhaS/24790849741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_5ff26252cbd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_601b9019e51cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_60175c30e62d1.pdfIn PDF document text
    • https://cdn.sqhk.co/kowipopi/PPPkjif/labyrinth_characters_names.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/nitajosasa/gobovebivurifepukadi.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/android_studio_change_package_name_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/16541103808.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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 5256 bytes
SHA-256: 8528a4441a1f2769b4a178e26c30b34515019ea15c207862f788fd898efeddc5
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10800 bytes
SHA-256: b4906e43342c1cbf031a39d8b13838c164674b20b81f98073c74fbefbb608b18

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