Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cea900b4f5cb66…

MALICIOUS

PDF

82.8 KB Created: 2020-11-30 01:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bd0cff235fccb57d132a13bf746bc15e SHA-1: 9d25c60d4e571c36b9275449b4ce03375c483174 SHA-256: 12cea900b4f5cb660aa94259751cef4bbb552229b59acf3870ec0ea74f7a1bd1
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 0.9996

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://traffset.ru/123?utm_term=code.org+app+lab+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446036/normal_5fa6dcebec5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f97242e19b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5fa6a7bbe0838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_5fa7c62051fba.pdfIn PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/5013474.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/4129883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f0658fcc-1f1e-4618-bec4-96d77e38e739/40809703065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f35319-a947-423e-8a22-0f2dad98b2e6/42394954620.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/chris_gasser_wadsworth_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f72bba-3314-4b4c-b250-00c71a167248/hyper_light_drifter_100_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402527c9-ab95-4c78-90c2-f41ee41041aa/7219536280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44c12bd-e483-483d-9efd-785ba1ea8fa4/streaming_film_bioskop_indonesia_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/bsc_1st_year_math_book_download.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 4988 bytes
SHA-256: 05521c614d4e07c71bfa02c374b6424831ca610076cbdf82a8388bf5f39e6e1d
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 10644 bytes
SHA-256: cf20e3ea41549037bf0756ea92f64180fa832dbcb9568ef6d6094514b65f1bac
font_02_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 11624 bytes
SHA-256: 60c8aec234cd1f92d435c07f065a414ec87fe5d19b537effe083283b41d1619b
font_03_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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