Malicious PDF — malware analysis report

Static analysis result for SHA-256 1551f480c6a1547b…

MALICIOUS

PDF

73.4 KB Created: 2021-03-22 23:34:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b7620dce9e58dc224eef66730510e366 SHA-1: 1e01c476c98c86f253988fdc419f354dce37604e SHA-256: 1551f480c6a1547b74a98b166ca66c7fbb0c5007cc2ae33c60fca6dbafe590da
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://pelibifir.ru/strik?utm_term=how+to+replace+staples+in+one+touch PDF link annotation
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/8555533.pdfIn PDF document text
    • http://qrastenmap.online/valag91ktx.pdfIn PDF document text
    • http://dorightschool.com/crossfire_series_book_29ne1y.pdfIn PDF document text
    • http://wonujabazuvopa.22web.org/kaganuve.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/5309508.pdfIn PDF document text
    • http://dimusenomi.iblogger.org/spring_framework_durgasoft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0583045a-13cb-43e1-9890-13a2f1fb41af/bmw_x3_service_engine_soon_light.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_d1ce64ea4aab4f14a6368b496bd12c62.pdf?index=trueIn PDF document text
    • http://zivuneko.epizy.com/keladevoruzejaregowab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855ce274-583e-4456-8bc3-7ff72ba4e752/how_to_reset_nespresso_citiz_and_milk.pdfIn PDF document text
    • http://wijixetav.epizy.com/76216853491.pdfIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_8d876529ac1a460fb08aa87ceb7d6d53.pdf?index=trueIn PDF document text
    • http://gesasodalunaka.epizy.com/bunipasipovatinegufevu.pdfIn PDF document text
    • http://vigujabufovejo.rf.gd/netflix_for_android_tv_mod.pdfIn PDF document text
    • http://zenadeguposu.rf.gd/ganuvejorunijapef.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_d002b3df68a742df9db55bbdaccbcee0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f17e237-a545-47eb-88a9-4010423f6e17/metivibi.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_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5076 bytes
SHA-256: d468ccb1d08f73a5993ed05bae8c422ec828ea890e40bff6557801f8adbb0cc2
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 11528 bytes
SHA-256: d8d2d5bc0a0466f622cca84eef1aa120a9dac394eb2e882daa09cf1a090788bf

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