Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dee85b8758a9f9…

MALICIOUS

PDF

109.8 KB Created: 2021-02-26 19:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 558efcbb675b15d839280e5f809a7ec8 SHA-1: 4cf509d3614d2b8feba0b66ec46a7d498511e0fa SHA-256: 43dee85b8758a9f91434f76341e711b34fcfc17eba8eaae682c8dee0268a1743
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/award?keyword=maserati+granturismo+mc+stradale+top+speed PDF link annotation
    • https://cdn.sqhk.co/zipedufipiz/ihbbRBB/pexedezalup.pdfIn PDF document text
    • http://boxberry-24.cc/how_to_heal_metatarsalgia_fastd88m5.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/920af2c19d84a.pdfIn PDF document text
    • http://sell-toclick.online/xalikepigodixosenamuw43uoc.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/b08d075.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/3829306.pdfIn PDF document text
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/defoveniguper.pdfIn PDF document text
    • http://gratoramaa.website/nuvinuvoxowatoratagyw89.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/dzhifia/37176347713.pdfIn PDF document text
    • https://giponijas.weebly.com/uploads/1/3/1/4/131453823/nufatebunuxudi.pdfIn PDF document text
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/3b57e0927f89352.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/h3ifzEV/xakanar.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/W2hiQhc/mijagokawodisi.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/niberesosevugujuko.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/di32id3/66194986773.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/did1hhB/miraculous_ladybug_chat_noir_games.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://topadut.epizy.com/fxos_command_line_reference_guide.pdfIn PDF document text
    • http://jiresigotapikeb.rf.gd/ncert_maths_book_5th_class.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 5280 bytes
SHA-256: 36a8a0e5d951daeb1b2b791a1899ea7362b34d7aa18f1f658a072f64183e9413
font_01_sfnt_off000156bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BC 15300 bytes
SHA-256: 14edd70491d19c86ca64b1cf456370ad561c10942fdc0e401d0bed75cae5a352
font_02_sfnt_off00018643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18643 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
font_03_sfnt_off00019ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AD6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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