Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0377ceb90498d2a…

MALICIOUS

PDF

109.7 KB Created: 2021-05-12 09:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 97eee22ec6b9921c47a073e32e986454 SHA-1: 69d339612d483c06fbb1ea51b0a1f752549665bb SHA-256: b0377ceb90498d2ae74f4468d36ef984ff0cf4d7ae0c46ce33a41115a51cd443
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with 'https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/kulel.pdf' being the first identified. The heuristic 'PDF_MALFORMED_EXPLOIT_STREAM_LENGTH' suggests an attempt to exploit a vulnerability within the PDF structure. The embedded URL 'https://jacksth.ru/strik?utm_term=el+conde+lucanor+resumen' further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jacksth.ru/strik?utm_term=el+conde+lucanor+resumen PDF link annotation
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/kulel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_606497955af0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5fcd0d3b63b35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fee66bd518bc.pdfIn PDF document text
    • https://daxuvinu.weebly.com/uploads/1/3/2/6/132695190/lewotibujasig_sivanuxij.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/86f32f9.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/8634538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_602dad2318b2e.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/28556139685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601c5bab719d6.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/dowukurefawubuvitime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_606c9405dde5c.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/wurivuve/17773978510.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/5119153214.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/best_natural_dryer_sheets_for_static.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/wevuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/41014631920.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/what_is_the_ansi_standard_for_safety_glasses.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001708f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708F 5040 bytes
SHA-256: 75fc09ecb7c787fbfce51dc03e0c867c2278262b5d3b3c32ffb1beea81ccf5fa
font_01_sfnt_off0001819d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819D 12252 bytes
SHA-256: 6e4d8df0c6fba4c6baebaa0e575bc1a400acacc5f9b38674cfa9fa852e0f409e

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