Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d370bebb28396d4…

MALICIOUS

PDF

78.0 KB Created: 2021-02-15 07:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8b1c7c77f939fa9a34266d5d3e70c870 SHA-1: 84f7b483aac616f5b908ac11a6ada2d198efcfcd SHA-256: 0d370bebb28396d41abd39849112c4de0208f446bc6039270ed4d952e003b51c
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://yafferge.ru/123?utm_term=passport+worksheet+for+students, is flagged as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to student worksheets. The presence of multiple links to disposable hosting and the ML classifier's high confidence score indicate a phishing or scam campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=passport+worksheet+for+students In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5feb265dcd8b1.pdfIn PDF document text
    • https://figagukedeliv.weebly.com/uploads/1/3/4/0/134040575/6c16af5.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/rilosonowol-dolojavuzusajup.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/binepabopab_jugateverutebi.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/wutiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe4fc980efb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5fd80fb9a368b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mezexefobotero.epizy.com/c._a._r._pet_form.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/ganunitawug.pdfIn PDF document text
    • http://damabop.epizy.com/jakim.pdfIn PDF document text
    • http://fepenupusabumo.rf.gd/fumejudorop.pdfIn PDF document text
    • http://timojakizufijad.rf.gd/acura_mdx_2017_instruction_manual.pdfIn PDF document text
    • http://dumevurofif.rf.gd/xanawusaru.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/cesim_simulation_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5252 bytes
SHA-256: e48aa984d877fb04ecbece15029f8750c54de5369d11e59e8005dc0fabac43fb
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10608 bytes
SHA-256: 329bb4317f5c9960dfa1fb0091687ea15e82c340fc26b1d1fb9b8bd965edf02f

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