Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c22fa082364be8…

MALICIOUS

PDF

82.1 KB Created: 2021-03-12 20:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66b6effb4ba58d5765c7bef2a54049d0 SHA-1: 795172d7a93955a4c0e0fe65758116d020dfcb4d SHA-256: 20c22fa082364be82681c76760d347a235febebb814244480469aec7cfcde92e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, https://soxebez.ru/aws, is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/aws?utm_term=how+can+i+tell+what+year+my+washer+was+made
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd14975e87a2.pdf
    • https://cdn.sqhk.co/nanagajog/jk3Oujg/dragy_unit_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4410199/normal_604651544c5d1.pdf
    • https://wirupexulabajes.weebly.com/uploads/1/3/5/3/135322132/765266bc51ee4fd.pdf
    • https://cdn-cms.f-static.net/uploads/4392864/normal_603b05c28a46b.pdf
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/7592499.pdf
    • https://cdn.sqhk.co/bisadumiza/WgchfSU/ak_47_kannada_movie.pdf
    • https://cdn-cms.f-static.net/uploads/4451205/normal_6026ed32c278c.pdf
    • https://cdn-cms.f-static.net/uploads/4393181/normal_6012963922436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezetega/lymphoblastic_lymphoma_treatment_guidelines.pdf
    • https://s3.amazonaws.com/babetafaperaxov/excel_shortcuts_in_excel_sheet.pdf
    • https://s3.amazonaws.com/mogedozara/how_to_explain_christian_faith.pdf
    • https://s3.amazonaws.com/zetubakuz/dexuwepigigipajepirovo.pdf
    • https://s3.amazonaws.com/numegubowalonan/yann_tiersen_comptine_dun_autre_t_guitar.pdf
    • https://s3.amazonaws.com/wovisak/arduino_mega_2560_driver_windows_8.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001053a.bin
b4777034b0ed5a3abe70dcc2b138c45a591bb69a7a6ad778fb0b24e739a39a74
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 5336 bytes
font_01_sfnt_off00011741.bin
1c99727d9a4ae60cc28bf37cb82c85e426bb9591df4144dae55ad51c8b68a411
pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 10664 bytes