Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87d51bc4194b910…

MALICIOUS

PDF

81.9 KB Created: 2021-05-22 19:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ba77adf65fcc4d3799adfc05177eaa3 SHA-1: c8844bb3017bdebbdfcedce42eb5daee24c13f06 SHA-256: d87d51bc4194b91083953694807a254b19c6cf893d68b38ce78dcd720b24ae6a
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URI pointing to a URL that appears to be a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=como+descargar+counter+strike+source+no+steam+para+pc
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6058da1c7e7a8.pdf
    • https://cdn-cms.f-static.net/uploads/4475863/normal_60526b346f0c4.pdf
    • https://fagovuwafarawa.weebly.com/uploads/1/3/4/0/134042706/rajazomokasu-kemumogapaf-perifimigebudi-porekeroge.pdf
    • https://sokijolixorinus.weebly.com/uploads/1/3/1/1/131163896/tedonavejarosus_xipakabutetuliw_lozujudasage_bajugozosojat.pdf
    • https://static.s123-cdn-static.com/uploads/4410983/normal_5ffb7490e64f7.pdf
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/buzejotuzifuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f1f9213-1150-4bef-93d3-1ad3dba9c9f5/return_of_the_king_castle.pdf
    • https://uploads.strikinglycdn.com/files/cd994415-396f-41fb-8c4b-04d113e5b79a/mawoxexel.pdf
    • https://s3.amazonaws.com/luramamelolem/adele_someone_like_you_chords_easy_piano.pdf
    • https://s3.amazonaws.com/pasutiz/chennai_express_movie_in_hd_720p.pdf
    • https://s3.amazonaws.com/dekogamik/definicion_de_organismos_coliformes_totales.pdf
    • https://uploads.strikinglycdn.com/files/dbf2f4d8-db9e-4a60-9f94-5497bf583a89/tascam_414_review.pdf
    • https://uploads.strikinglycdn.com/files/9898841a-cf0a-4b8b-a338-afd99ec8dc1a/kisaxuzupuraxu.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/disney_princess_coloring_sheets_free.pdf
    • https://s3.amazonaws.com/bezegoluzose/98023469582.pdf
    • https://uploads.strikinglycdn.com/files/252fce16-1179-464d-bb59-e71bb77cc5b7/the_man_in_the_high_castle_season_5_ending.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd94.bin
c831c0099bffbf94db1c9580b4cb35a0384fd9e709a536bff0a7677d877bee30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 3312 bytes
font_01_sfnt_off0000e958.bin
d2a3c49c3c0b2798b404009f8aa723ec26883938163877276d9b9b8f58b4ecc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5332 bytes
font_02_sfnt_off0000fb63.bin
0f324f38cf53c75a951ea6e67579172381b46027e40204d4d15f733520022adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 12040 bytes
font_03_sfnt_off0001227c.bin
2a726e4d8e078a4a4a6a0bed67b139344cab8167eb027720faf42c08020076b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16120 bytes

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