Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a55a6b97d2ef86…

MALICIOUS

PDF

90.4 KB Created: 2021-04-04 20:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4efdf06fa2c882b0def145601477ef17 SHA-1: 2307905e3dc7ecd2f963ecaaf83274f60a11204a SHA-256: 04a55a6b97d2ef86268ae6d527e257fd7a0d8532a820910377bb601995986d45
186 Risk Score

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 0.9997

Heuristics 6

  • 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.
  • 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://nipisod.ru/award?keyword=reliability+testing+pdf PDF link annotation
    • https://cdn.sqhk.co/luwanuriwaba/ihdTDdq/guzititilogebijuzojireden.pdfIn PDF document text
    • http://monoga.space/28098717721n1kyy.pdfIn PDF document text
    • https://cdn.sqhk.co/jukapaba/hjhfhfM/samsung_level_u_price_in_qatar.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/blood_angels_codex_supplement.pdfIn PDF document text
    • https://cdn.sqhk.co/lidumezuvir/jjjgdgd/closure_axiom_unique_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/bosareke/gShhhia/download_neon_hockey_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/TLLwBnT/likapesalolefumugumaro.pdfIn PDF document text
    • http://coolvdomaion.online/simply_the_best_lyrics_coverlfbsy.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/doxovisigedupuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/hi5R7ih/64619056890.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/hannah_arendt_sobre_la_violencia.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/nupoluzejikeduko.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/jcieZge/fajovezosimavogogiti.pdfIn PDF document text
    • http://buyfastedcircle.xyz/6646426212zng0m.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/4ldgiIH/45593722897.pdfIn PDF document text
    • http://eliyalte.com/gegututekomute5yals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_ed2dde477ea54c8abde0b842a418ddc3.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_0b493ad479e5489994a9d28c9973610a.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_7f4bc43de1ec4cd0964c6f6058c5ecbb.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_e27dc03ff0fe49a884cd9780b26bf2f9.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_3a995b1d62c54aaea91ae9202326423f.pdf?index=trueIn 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_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 5360 bytes
SHA-256: d029ed600c7c05ac83fa4cfdf133fe97cb7ab30a9d66f5d7d51191cf35d731e3
font_01_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 12880 bytes
SHA-256: 8c412b0e12ff8d4a41ea0c230ad2575193bab08d7dfdbe614169a77c37eb1163

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