Malicious PDF — malware analysis report

Static analysis result for SHA-256 15305ad89e229901…

MALICIOUS

PDF

78.0 KB Created: 2021-02-19 02:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 22de3831049cd82ab59fb6409af0cccf SHA-1: 2fb62ec069860dbf1b55290d6d10f0a13c429576 SHA-256: 15305ad89e229901403a39985ccbe80bf8e3958dbad7f202cf075f3f4e452875
136 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is part of an SEO link farm and uses a redirector to lead users to external URLs. The document body, though heavily corrupted, contains text related to an HP printer, suggesting a lure. The primary URL identified, 'https://seumenha.ru/strik?utm_term=hp+photosmart+5520+ink+cartridge+missing+or+damaged', is likely the malicious destination. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=hp+photosmart+5520+ink+cartridge+missing+or+damaged PDF link annotation
    • https://cdn.sqhk.co/jovowosifo/iHThbhh/real_japanese_claw_machine_app.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/2572857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff15ba4522bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_602ae284ccf4d.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/ibKjbhi/vimeliwiket.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5fed76a0d041c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_6026d86d2f17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_60289f2970d4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_6017897899ea8.pdfIn PDF document text
    • https://kofudisefases.weebly.com/uploads/1/3/4/0/134018526/zagowosigesoguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_601ba3da3490e.pdfIn PDF document text
    • https://tudaxuvogune.weebly.com/uploads/1/3/6/0/136082380/rarugopevofita.pdfIn PDF document text
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/c7364.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/fowikorejodi/android_attendance_app_for_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/automobile_vehicle_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/pakebaguro.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/namo_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/cetoacidosis_diabetica_y_estado_hiperosmolar_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/audyt_energetyczny_domu_jednorodzinnego.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/wows_chapayev_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/gujurorofif.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/behaviorally_anchored_rating_scales_performance_appraisal.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_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 5876 bytes
SHA-256: 6165a5facfbd7c65fb83eb6e9138f4f49d099803e4b6be6cbb31e2c3fcdc3a5e
font_01_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10804 bytes
SHA-256: aa20093758ff8c28adbd081de988e79025155bb5fab5e35f6f01dbc930aaf736