Malicious PDF — malware analysis report

Static analysis result for SHA-256 300f4ad4fe7c156f…

MALICIOUS

PDF

78.0 KB Created: 2021-02-01 07:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1505fce9dc4d913b3247772b3d322b93 SHA-1: 16e3bbf9956826ad73ff1987857a5f50f1380641 SHA-256: 300f4ad4fe7c156f215cd51f0e9349a34bc5643f0ce5047c12da6d5b36107251
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially phishing-related. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One embedded URI, 'https://jottigo.ru/aws?utm_term=how+to+design+user+guide', is directly referenced, indicating a potential lure or redirection point. No scripts were extracted, but the PDF structure itself facilitates the malicious linking behavior.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/aws?utm_term=how+to+design+user+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5fdff9ab04917.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuwizatag/xb1Bjhi/the_rental_cast_killer.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/wukagezejowazofugaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495550/normal_5fe9c70e9a7c4.pdfIn PDF document text
    • https://cdn.sqhk.co/xalurubizud/6jazjg3/48498235398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465393/normal_5fef0f5de5c3c.pdfIn PDF document text
    • http://blaugrana.ru/149909683n0wmz.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/K5jfYUn/99196852920.pdfIn PDF document text
    • http://amst-watch-v1.club/49313409389kdsfr.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/gijfljg/visewawatamijoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fe6fdeab6d8a.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/mkXhjPe/7883241586.pdfIn PDF document text
    • https://cdn.sqhk.co/woxutonezem/afjchhm/ginuje.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/ijkTUiU/fujitumusaluwojefox.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://binasizula.rf.gd/adjectives_worksheet_grade_6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 4688 bytes
SHA-256: 6d50dcaa07a98fc5072adfca62be1c0d0619982dd00d48843cca8f5b8d489938
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 10948 bytes
SHA-256: 95a669c331299ad4dcc1876fdbd74d954fc9a903ac4d16386c17a04c01e82bd6
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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