Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bcbaef8e2c0ff6…

MALICIOUS

PDF

82.5 KB Created: 2021-02-28 15:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 53a536451b4900d19d314bdefb635125 SHA-1: c67fc09ec766c21dc1a0c7d9acfb43c6c1507bce SHA-256: b6bcbaef8e2c0ff66b380bcf714f4bf3d535e56c0393df2320b0a9424fdfc180
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to user manuals, indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/wix?keyword=kw-r910bt+user+manual+pdf PDF link annotation
    • http://zokidinodajives.getenjoyment.net/kovuxavapawiker.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/finnegans_wake_download.pdfIn PDF document text
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/856eeaab031453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482018/normal_5ff0890361a8b.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/43677964806.pdfIn PDF document text
    • http://gajitad.22web.org/8396887859.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/3851222.pdfIn PDF document text
    • http://soxiwokix.iblogger.org/buwaguxobavepim.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/CWgigco/28821824920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fc73fe9a1f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_6035555d364c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5feec4fe28b69.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/H3Al8je/kabowixomawugubat.pdfIn PDF document text
    • http://sosiwuro.iblogger.org/characteristics_of_good_research_tool.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/b7WibCf/city_smash_mod_apk_download.pdfIn PDF document text
    • http://godevibusaxinoj.22web.org/bujurowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojikigor.myartsonline.com/yoga_book_c930_test.pdfIn PDF document text
    • http://tutivute.epizy.com/administrative_court_guide_2017.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/why_wont_my_sprinkler_zone_turn_off.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_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 5772 bytes
SHA-256: 7bc3c94649d4ee853c3c91c3fb75d2ff5e156e788079a9c99f58238feb3c9ce6
font_01_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 10660 bytes
SHA-256: 8b9a24dd8d673d1c479a3d8299ca304eacef145b28caf3f0aa75f222ef40f14b

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