Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5032541475d5fbb…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 09:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00d4e7520ab04eb083dd4f95fd3d8aa9 SHA-1: 3fca43b3be9425156f607663f761a040525a2d1d SHA-256: c5032541475d5fbb382569b3e26dc4d1e7f7fa52d7627587e9b2fc86243db1f9
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains multiple embedded URLs, one of which, 'https://vilenefex.ru/award?keyword=construct+validity+in+language+testing+pdf', is flagged as a potential phishing lure. The PDF structure and embedded links suggest an attempt to direct users to external, potentially 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://vilenefex.ru/award?keyword=construct+validity+in+language+testing+pdf PDF link annotation
    • https://cdn.sqhk.co/puzadowoke/ajguFjd/vezotabe.pdfIn PDF document text
    • https://cdn.sqhk.co/nulojokine/he4jeOB/ninja_foodi_air_fryer_recipes_french_fries.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/cuBshcb/xeviwikewizutag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495246/normal_5fc5e7c787a6f.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/sdyrhcv/rugewavuduvakixivigedit.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/r7Thaij/fiwizezinijoli.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/giBtXgi/32960416831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_60476d3389ad1.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/slhig4o/hexxagon_game_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jenepopavuse.epizy.com/blank_invoice_template_excel_free.pdfIn PDF document text
    • http://pitefabe.epizy.com/kubler_ross_5_stages_of_grief.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/wulog.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/40850854152.pdfIn PDF document text
    • http://xosekipile.rf.gd/vijawakurozivimavegexo.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/54996363129.pdfIn PDF document text
    • http://lidazadopedu.rf.gd/bheem_cartoon_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5392 bytes
SHA-256: 7f5d14a08eac8e365a8b0b91e1edad4c2c57d27297a99c439dbc7628b3b551b0
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 11048 bytes
SHA-256: e860e1b4a92586aabc9f9888b0360da0a5ba6eaa60fbfd04678434909d8f3368
font_02_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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