Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a51ab638362b74b…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 00:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9e89b3b93a18756354d452445316254e SHA-1: 5270ef8181498968bec02fbc6e90f4fdb0c0746e SHA-256: 2a51ab638362b74bc450e164efd6b0d05216ba96182f5913b6b9cabdaa064a3c
156 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 0.9998

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/award?keyword=binary+block+codes+pdf PDF link annotation
    • https://pajegilawemate.weebly.com/uploads/1/3/4/8/134895984/3638221.pdfIn PDF document text
    • http://wiinorama.fun/14420782645bxa90.pdfIn PDF document text
    • https://vatizojisizekig.weebly.com/uploads/1/3/4/8/134852150/2801cea5e0a8.pdfIn PDF document text
    • http://cleaner360.shop/dj_khaled_video_songs62ju5.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/what_are_the_10_korean_vowels.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/principles_of_corporate_finance1o1b0.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/80916580331.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/satulibaren/fidakitupizita.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/saxopa.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_0d5627f7b564423c93d9903c6a6f67f5.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_bd4a109ec5714701bb122c1eb7cc68ea.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_e12d5f8ee78c405bb86262ab3e743fa8.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_6d8fc84e3a404011832e328840fd3f7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/origin_and_evolution_of_bryophytes.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_753a69cbaddc4b9c822839fd0978a3ff.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_43342d9db8104fe986495041ebbf766e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/ultra_street_fighter_iv_apk.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_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 5504 bytes
SHA-256: f22b47abd5382f61c6ccf500e940511078cec087d7b589fa2086ee2ca1eba10f
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10672 bytes
SHA-256: 259069596273569620116e292bd01af05192d799abfc84ffd372f34aa27884e5

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