Malicious PDF — malware analysis report

Static analysis result for SHA-256 32110050a119027f…

MALICIOUS

PDF

62.1 KB Created: 2021-02-21 03:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d59f33eb7bb92ed982a4c9cdb293dcb4 SHA-1: f68411d4e198b19e97a4549eacdf986a35ca79ff SHA-256: 32110050a119027fb35278c4b236b766d681c3c67db6c3fb409ecaf21296d6eb
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=advanced+calculus+woods+1926 In PDF document text
    • http://easterthjg.com/fleck_7000sxt_water_softener_reviewsb8vfg.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/gffssC3/memuzamaputewejeju.pdfIn PDF document text
    • https://cdn.sqhk.co/tizesefetus/icagjQ9/xuzovojadamebosejikokorov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_601eaa1d7db91.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/manual_de_usuario_bmw_x3_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/PXXhdjZ/picture_collage_frame_with_clips.pdfIn PDF document text
    • http://ragadugizidej.22web.org/worksheet_excel_missing.pdfIn PDF document text
    • http://4escam-bot.online/aroma_arc_914sbdxe86a.pdfIn PDF document text
    • http://replyua.site/hva_er_epileptiforme_anfall2ilvq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451566/normal_600817e95c80e.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/0eiahch/wotaperenifogexixeg.pdfIn PDF document text
    • http://gudakiradajonob.iblogger.org/18666695285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tibubol.rf.gd/u_dictionary_apk_for_android_mobile.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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 5472 bytes
SHA-256: b30d5be610cb780c548924feef2c383179e516247095e1a255574e949c713f42
font_01_sfnt_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 9824 bytes
SHA-256: e88670926326b90e7ea189d9cdb4c275a478d161c685243443c5775832e5af78

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