Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf13650ec0977828…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 14:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 998b2dac3afc476e2f48c92c501ffc9b SHA-1: fab588eae9582524d46e19207bfeb8649cea1b69 SHA-256: cf13650ec0977828a1276874f7bf3764966408269cd415169912855b2d3c98fb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/wix?keyword=the+dream+carrier PDF link annotation
    • http://xuwuvewisin.mypressonline.com/nidowetowagaz.pdfIn PDF document text
    • http://damvglaz6.xyz/8914940813162wt4.pdfIn PDF document text
    • http://myirn.icu/3467405055kvyn2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_5fe4007b63781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_603570d0e3385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_602c673ae73e4.pdfIn PDF document text
    • http://walkover.me/remikagizip8atpv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6049d74c8d4f0.pdfIn PDF document text
    • http://proba7.xyz/le_noirmont_suissejidol.pdfIn PDF document text
    • http://filfex.ru/namupogujj6qq.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/aiag_machinery_fmea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_6018a7e84e7aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414153/normal_6008c68c7e660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_60395909458ec.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/c16544de-60cf-4bf3-a5b3-e94c24e03cfd/89752825459.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_79f77c9d903e4604bcb2a7ff73bbee96.pdf?index=trueIn PDF document text
    • http://negumigimewote.onlinewebshop.net/tinanisogiwezusipaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24449f51-8b4a-494b-ab6a-f4806d9d7a11/ferrari_california_2020_for_sale.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_2b46a06718b546e28d8f31b2e3099ad6.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_03d34ae780a541e0a238704e4c3975dc.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_f27908449ec546439751ca4338d157b2.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_d65d928171344f5baba9083bc023da6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b6f3d5-8524-4ce2-be73-53ca2b443a65/show_me_the_closest_dunkin_donuts_to_my_location.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
stream_002_off0000e5c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE5C6 4920 bytes
SHA-256: 8927a52f0da24538c96d6308656e1880aedeb6b3238679f512e071125a4cb858
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 10664 bytes
SHA-256: 825e62af74bd0773c4b4a6531f555fd3a4061ce5873f20c1adcec3143deb55fa

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