Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e0a005c34a0721…

MALICIOUS

PDF

96.7 KB Created: 2021-03-19 23:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a3ca99187c1b7cbecca94bba21bc64e9 SHA-1: b0e23dff247ebf1da3cbd96b191149923ddf1dd5 SHA-256: b8e0a005c34a07211cd24f99e6ec8ccfa97a05435bde86fc71d05f14d171b311
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=solidworks+cswa+answers PDF link annotation
    • https://cdn.sqhk.co/gagobuniponi/jhgijhj/kickboxing_kings_lynn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_601f268697739.pdfIn PDF document text
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/tolivopotigoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_603768edc1869.pdfIn PDF document text
    • http://rofuzixaveminup.iblogger.org/why_do_we_study_theory_of_computation.pdfIn PDF document text
    • https://wepopoxewu.weebly.com/uploads/1/3/1/1/131164118/luxevuzefutek-defixugo.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/hjakiaP/safety_briefing_meaning_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwoxigawezab.epizy.com/zusaviv.pdfIn PDF document text
    • http://falufobi.epizy.com/39182130065.pdfIn PDF document text
    • http://gebibem.epizy.com/deer_food_plot_planting_guide.pdfIn PDF document text
    • http://tisiwiruligeg.epizy.com/gapaxoruto.pdfIn PDF document text
    • http://fudotebu.epizy.com/apnea_del_sueo_2020.pdfIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_d8699dd337174211beb81296ab17ea9e.pdf?index=trueIn PDF document text
    • http://gifetezese.rf.gd/74151776280.pdfIn PDF document text
    • http://gedikoti.epizy.com/boy_girl_friendship_songs_in_tamil.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_b6901668b7294affb6c5ef904fadc3dd.pdf?index=trueIn PDF document text
    • http://zifawikixeliba.epizy.com/isa_800_revised_audit_report.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_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 5192 bytes
SHA-256: 66853343e27f3a3c1109368261fc970f3e47749f2636579ecd6cc92b35220d43
font_01_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 13144 bytes
SHA-256: ce273b8b706aab5fe47e52e6f1025e9fd0e84bccd615d3cfcb5899c71333227d
font_02_sfnt_off00015f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2F 16448 bytes
SHA-256: bc6d684f813ac1c32be8bd0fe15b7813cdddcd900b6f98dcbbe4bb93017ec79b

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