Malicious PDF — malware analysis report

Static analysis result for SHA-256 c515c0f01860feda…

MALICIOUS

PDF

74.5 KB Created: 2020-12-17 02:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 012e11ee70ba0a193dd4a8f06e369f7b SHA-1: 558e4070bc90556a8863a7070b4cae2effb84363 SHA-256: c515c0f01860fedadac5c0aa479db63797f6bc75a443509cf850f8ecabc671c7
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm, designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and the presence of a download button lure further supports a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=free+household+expense+tracking+spreadsheet PDF link annotation
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/bowilokilawox_dopekew_fitefaw.pdfIn PDF document text
    • https://kobijetiva.weebly.com/uploads/1/3/4/3/134322382/72667ab.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/birizaje.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/14f884.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/4587067.pdfIn PDF document text
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/d645153a46fc3c8.pdfIn PDF document text
    • https://virukuzababije.weebly.com/uploads/1/3/4/3/134350100/7819426.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/tagiral-penabazolame-mulasujoxevozi-gepevavutabo.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/mesixadelomomo/gopro_hero_manual_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/denton_flea_market_380.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/diabetes_60_system_scam.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/43332007063.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 5420 bytes
SHA-256: a868f756f9b45df8c35b71dce1dab1e6eb6d25b1da5000fd8daf825996a76ca7
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10612 bytes
SHA-256: 97b0defff31f2cbb04513cc1f5e5da36dc82134e6cfed4380c259752ac80cd8c
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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