Malicious PDF — malware analysis report

Static analysis result for SHA-256 9502f08b25b7ed30…

MALICIOUS

PDF

84.1 KB Created: 2021-02-26 18:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3df3de6c562b3e852a5ae586d950759f SHA-1: c20becae578d228719e2dee4577e1cb08b947e88 SHA-256: 9502f08b25b7ed307da61d042fc2525c52826b7ebe839753f0113d243d451f93
126 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

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://xajibur.ru/aws?utm_term=what+food+goes+well+with+red+wine PDF link annotation
    • http://mastericy-chistoty.ru/nutrition_through_the_life_cycle_6th_edition_ebookeur3m.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/67429913645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_602b975c2f8c7.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/elements_of_music_emo_rap_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_6027bf7d32e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60300ef8d0f95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476595/normal_5fdf280f7590e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487618/normal_5fcd1a1303c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_601f657789686.pdfIn PDF document text
    • http://reawont.online/655686919476nalj.pdfIn PDF document text
    • http://topuniversityru.fun/40359323587vrjzi.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/windows_server_2012_r2_standard_iso_download.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/pibabopuduj/hypnotised_coldplay_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/jesulifaxefuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/ff6_shadow_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/whos_the_killer_in_the_girl_with_a_dragon_tattoo.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/luvosodiziwokixo.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_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 5272 bytes
SHA-256: 3e7721aa13bc770124d8c18a998f2bfe890eef331571fffdca2ef43d57b3b5b7
font_01_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 11044 bytes
SHA-256: 3403ba70d51f9b152c9a4c08525a6b818cb22d5ca69c7ddb5025b3b3a0c4d571

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