Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a1fe912d94dafb…

MALICIOUS

PDF

90.6 KB Created: 2021-01-22 02:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c910e99a18693992e21dd3098676c00b SHA-1: 8711a5f2ca3544518fd4620126dcc45df1203edd SHA-256: b3a1fe912d94dafb3c3931777da7a2f9ba3637f31c83a9dc593be6ea7eae93d9
96 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to host a phishing page. While no scripts were directly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/123?utm_term=langmuir+circulation+and+instability PDF link annotation
    • https://cdn.sqhk.co/lipebefaje/he0iglI/68228546058.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/hfhehhc/polish_sandwich_shop_vienna.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hhrjgMi/95080003503.pdfIn PDF document text
    • https://site-1178961.mozfiles.com/files/1178961/21513313546.pdfIn PDF document text
    • https://site-1215102.mozfiles.com/files/1215102/xiwotamoremonevasofugezo.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/23282837237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_5fd0bd0368c8e.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/suzujewa/57566879490.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/chikati_gadilo_chithakotudu_full_movie_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/asuran_dhanush_bgm.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/parametric_and_nonparametric_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/lozik.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/12238375266.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/jitegaji.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/brave_browser_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/xawefosirasujofol.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/80165026941.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 5444 bytes
SHA-256: 85f0d015356d918932879ea118887de57fab9c339251ef25ec713eb6a10d387e
font_01_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 12452 bytes
SHA-256: 930250ac40b6b24e67a30a61ab4262b4dd742149089b2232718b04245cc209af
font_02_sfnt_off0001480e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480E 16160 bytes
SHA-256: 4c98065cac1f184ae67d201e5fddc7cac4b1e71ba9106450a0a8b62930c944d5

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