Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3872ef6bd70e374…

MALICIOUS

PDF

103.7 KB Created: 2021-05-11 06:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dc0946775d2390a1ddf8a0451fbb4d48 SHA-1: de9bb2d8d0bf752daf68d375060de72b8c110439 SHA-256: f3872ef6bd70e37487cbf670665bf0a2f9f530f65008fe868951485905b998ed
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 0.9997

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://golowaki.ru/strik?utm_term=2019+porsche+cayenne+owners+manual+pdf PDF link annotation
    • http://comforfemj.fun/53901984345q4unr.pdfIn PDF document text
    • https://vuvitolivudiru.weebly.com/uploads/1/3/2/7/132712253/50c40b6922a8ce6.pdfIn PDF document text
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/fepalalebisaje_vojujedifuroben_vawelagaja_vubel.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/1598294.pdfIn PDF document text
    • https://danonifakusore.weebly.com/uploads/1/3/1/4/131483465/6291539.pdfIn PDF document text
    • http://pimolala.22web.org/nasomevaxezemut.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/buvumuvofozekirulimo.pdfIn PDF document text
    • http://metryck.info/86409958306hbk1z.pdfIn PDF document text
    • http://barefegek.iblogger.org/machinist_handbook_press_fit.pdfIn PDF document text
    • http://vashmaster.info/dusopojupaxeluvokemixadwj15i.pdfIn PDF document text
    • http://luminar4-download.xyz/sulumunofuc1v8i.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/zobuwubedak/the_presentation_of_self_in_everyday_life_erving_goffman_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/sivowi.pdfIn PDF document text
    • http://zilagojusorevu.epizy.com/problem_solving_steps.pdfIn PDF document text
    • https://8bbfbdb8-1895-4472-a1c6-9e834ce25a60.filesusr.com/ugd/7deb27_ebacd6e185964ce7be478a3c3a6a981c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timituvupame/wonanoxirabaxezejasapu.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/shield_logo_vector_free.pdfIn PDF document text
    • http://pewokes.epizy.com/mcdonald_s_australia_nutrition_information.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d88c188e28fa44a1979f1d3bdc2ed4ac.pdf?index=trueIn 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_off00015403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15403 5976 bytes
SHA-256: 2eda819a4a72893369838b1b0f7ba2be40f9ea6c6b6e29605164fe58fbf20002
font_01_sfnt_off0001684b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684B 12084 bytes
SHA-256: e5329871ce8de3b1eac34fd6125dde7be83da0e383b5b226026c4d855d50412e

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