Malicious PDF — malware analysis report

Static analysis result for SHA-256 158cea7558bcf8fe…

MALICIOUS

PDF

88.1 KB Created: 2021-04-08 09:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c7a3e4362e966cc753358757e6f0f4d SHA-1: 2f954601f32b063c6d99a651a974876efb561644 SHA-256: 158cea7558bcf8febb60f2969242276cfd0d36e5281106305f4079b576386336
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=chicco+next+to+me+crib+manual
    • https://static.s123-cdn-static.com/uploads/4455898/normal_5ff114d1b86ae.pdf
    • https://cdn-cms.f-static.net/uploads/4460232/normal_604776e2b2fdb.pdf
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ffa01047e035.pdf
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60502728eed02.pdf
    • https://cdn.sqhk.co/benibavagoge/djdBwpG/34230879567.pdf
    • https://cdn-cms.f-static.net/uploads/4387715/normal_60221a56ee50b.pdf
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fd96e428b72a.pdf
    • https://cdn.sqhk.co/nujobuja/1FcIMib/rebecca_corbin_murray_hollywood_reporter.pdf
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5fcf4da85331d.pdf
    • http://gikubozudunol.iblogger.org/7879715409.pdf
    • https://cdn-cms.f-static.net/uploads/4444113/normal_600cd00a38502.pdf
    • https://cdn-cms.f-static.net/uploads/4487905/normal_600df14379a5e.pdf
    • https://static.s123-cdn-static.com/uploads/4470979/normal_6004d6dbe9982.pdf
    • https://cdn-cms.f-static.net/uploads/4385636/normal_602f39eeb907c.pdf
    • https://cdn-cms.f-static.net/uploads/4489734/normal_5fd09f4481ad1.pdf
    • https://cdn.sqhk.co/wetilusogaki/jjrP82p/xepom.pdf
    • https://cdn-cms.f-static.net/uploads/4503584/normal_6046c4f3ea4d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fowimudetaze.epizy.com/can_roku_do_disney_plus.pdf
    • http://sajufevamofu.epizy.com/81453876551.pdf
    • http://buketoxepebaf.epizy.com/zudetifojobabixedemima.pdf
    • http://zufagubiles.epizy.com/21915066502.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_off0001187b.bin
6857211b7b9c372ece2c34b827c965e6ab85a28f7804d2ebe0a00500b3e189d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 4972 bytes
font_01_sfnt_off00012938.bin
c150e9de7c0271f68dbd272fd90f5d6b56571485547093d97fe2641f077cf0d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 13376 bytes