Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0aa5e30ecafe86b…

MALICIOUS

PDF

74.5 KB Created: 2021-02-28 15:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52086c15cac63934d2477339a1327385 SHA-1: 63810b3001d203faef303f08de428d6d1280cfe0 SHA-256: b0aa5e30ecafe86b985ce863e07e44350379c3eff0f5eed2ba3b97548b30de1c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical finding for a link farm and a high ML score, indicating malicious intent. It contains numerous external links, with one prominent URL pointing to 'resalured.ru', likely serving as a lure for users to download further malicious content. The presence of a password-protected archive lure suggests an attempt to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/123?utm_term=plan+de+estudio+de+la+biblia+en+un+a%25C3%25B1o+pdf
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/xadedumav-relonodamos-xareva.pdf
    • https://cdn-cms.f-static.net/uploads/4372378/normal_6024335ca69c5.pdf
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/5e8cbc46f637.pdf
    • https://walegizagoz.weebly.com/uploads/1/3/0/7/130775215/da058b.pdf
    • https://kogezuzoxato.weebly.com/uploads/1/3/1/0/131070880/4f39c147467.pdf
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/sabetutatu.pdf
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/1402855.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vapoborino.rf.gd/wordpress_bangla_book_free.pdf
    • https://s3.amazonaws.com/vuxirefare/7736570151.pdf
    • https://s3.amazonaws.com/pomaxa/pomuzaxifotajo.pdf
    • https://s3.amazonaws.com/kuxegu/clsi_antimicrobial_susceptibility_testing.pdf
    • http://refaruzevogot.epizy.com/kenmore_elite_smartwash_quiet_pak_9_he4t_error_codes.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_off0000e39c.bin
a7a3efa64a465dd8fafba1cd0ff0290abd6dcce05a6dc16286f2722d9afd890c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 5292 bytes
font_01_sfnt_off0000f56b.bin
db6e343ca260d0c390871a3205f50fc86d93c26a407be342c6b9f5d4c150a343
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 11444 bytes