Malicious PDF — malware analysis report

Static analysis result for SHA-256 21388f77ccd1df33…

MALICIOUS

PDF

78.8 KB Created: 2021-05-25 00:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e6d5b6683e7a6c5fb61708d4c67fa0be SHA-1: 748616d78f89b292285349427d83937bd4e98f2c SHA-256: 21388f77ccd1df331c2634b43a4e88ec3282b6c240e3d43cd1269cb9f48a4cbd
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=padman+movie+download+skymovies PDF link annotation
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/lavofale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_60541d1fd15ee.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/3c19cd796d2eeb.pdfIn PDF document text
    • https://walanugenaxoduf.weebly.com/uploads/1/3/5/9/135964425/3ecefab795851f.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/49c007e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_5fe768428fce1.pdfIn PDF document text
    • https://nokuzase.weebly.com/uploads/1/3/4/7/134765685/lufiw_jedogevitixeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_602742b341a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_603ce8c790457.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/mefadedosuw/stainless_steel_sheet_bright_annealed_finish.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/film_korea_bed_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/motebakabaputabi.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/71904659344.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/how_to_replace_gas_stove_igniter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fecb6a4-da61-481c-a8ae-feda7d1a88ca/por_que_es_importante_el_liderazgo_en_las_organizaciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a25bfb-9b61-45ea-b4b3-196b05618ef4/king_5_capitol_hill_seattle.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/apple_airport_extreme_a1408_manual.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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 5192 bytes
SHA-256: 48edfd37dd4b6ade72ef9b377dd95f1c5a08479160cd960a95740c60a11f4209
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10732 bytes
SHA-256: 6bdfb09767e3961a701255a74447f8c24c9aa7c4fd874368ff78d0701d52035b

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