Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec246bf3c2b8afb6…

MALICIOUS

PDF

72.3 KB Created: 2021-02-16 07:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f298cb6c12cac7b07d3ceea1be63103 SHA-1: 908fb1c49643c6ef0fbf2d62af1bfded9788815c SHA-256: ec246bf3c2b8afb6fc3fa7e26e37b34e82ee7c93efea1957115f5b2e77c34a9a
206 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or phishing campaign designed to redirect users to potentially malicious sites. The malformed stream length heuristic also points to exploit activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=flowers+in+the+attic+movie+1987+trailer PDF link annotation
    • https://cdn.sqhk.co/jufebarur/hfNWgcX/78599366875.pdfIn PDF document text
    • http://mif-smeh.space/664220010575qlmj.pdfIn PDF document text
    • http://instapriz24.online/pelutogilufozgqrvf.pdfIn PDF document text
    • https://cdn.sqhk.co/ripowusaro/cIhbQ3B/nidakuzazib.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/Bxjagd0/basupavijiremoweve.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/ihgijxU/outliers_by_malcolm_gladwell_summary.pdfIn PDF document text
    • http://iclod.tech/english_9_task_10_delving_deeper_answerh02cs.pdfIn PDF document text
    • http://20970907.net/dukuxiroxewakftiox.pdfIn PDF document text
    • http://visezuxopusifik.iblogger.org/membrane_function_pogil_answers.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/tubijebi-vupuroguzevir-gerukoresuri-babifofaperunid.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/hdVhe4C/grim_clicker_chest.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/375252.pdfIn PDF document text
    • http://susurrus.space/authenticity_50_percale_sheet_setatdr9.pdfIn PDF document text
    • http://cleaner-inn.club/junipurobodiwamut49qv4.pdfIn PDF document text
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/65058653ddc.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/def4bf2dce038.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/8637761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujevevurisul.epizy.com/fifevogonuxamakifipaxewu.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 5628 bytes
SHA-256: af0589c3ce48736489317f512fc2675f3e6af8980d7de8ed7061191ba105b1e3
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 11196 bytes
SHA-256: 72e37422753b3d9210011bdd100223f3e14fbba2624a25b31f210a2fa5c49cc0

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