Malicious PDF — malware analysis report

Static analysis result for SHA-256 f296f279eb035b1e…

MALICIOUS

PDF

81.5 KB Created: 2021-03-17 21:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a11901d670b10c55972c9983354f2d55 SHA-1: d6dab1fcc470101d0cd2cd22995975808e24cb50 SHA-256: f296f279eb035b1ed1ff5775f197a613b21e707b4ac66bd31257e65afbe18734
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=skype++windows+10+64+bit+filehippo PDF link annotation
    • http://helplnstagramcontact5087423.com/obusforme_65l_backpack9qdzx.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/3935867d3.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/5820570.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/bhimavaram_bulloda_song_naa_songs7nlfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_600a9aa0d3f25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fcfb32187cd2.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/vonutavekip/plantronics_voyager_legend_pairing_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/netflix_pc_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/velegulolixuloxolotomar.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_ca77524adc974a3c923a5d55dece88cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/epson_workforce_2630_ink.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_ad28cd1a54ad4065bfb46700c4dea9c1.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_950207987720465fa1f46fff48d46753.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xujitezu/xogamutunatewufedefopemed.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/riman.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_d4df3ac8f65148039ab14028ae8f165e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/yfn_lucci_ray_ray_from_summerhill.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/mixepeno.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/77942334992.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_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 5760 bytes
SHA-256: dbabe1a390f9e82e8991f69e1e021ac68ade1e899053adde6bb70ffa2283c931
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 10460 bytes
SHA-256: 445d82dc6d46dd37a4643dd86c46803822a4b3eb5778b73617bdf9a0aebef123

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