Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d9fa5187d85049…

MALICIOUS

PDF

66.9 KB Created: 2021-03-03 04:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 519611e15c2396f39dc172addc484341 SHA-1: 59eab40a40cb77760aa50013b50bb18d4f990bf8 SHA-256: a2d9fa5187d8504999b1b8c515f7ecfdd9f215c35952bdd73ed34c3440158d74
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://lozipotod.ru/award?keyword=digital+logic+design+morris+mano+5th+edition+solution+pdf PDF link annotation
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/zetepenomum_zuzozasagef_gexozasuruxe.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/ssuicjb/xulegap.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/sapevu.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/cf175aad4.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/5000377.pdfIn PDF document text
    • http://websporizle3.com/aashiqui_2_video_songs_free_1080pd439q.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/b7e154973f80.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/zurujuduwaril.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hjiija9/19482078269.pdfIn PDF document text
    • http://liketime.fun/25636243271su09n.pdfIn PDF document text
    • http://ig-copyrightnotice.com/how_to_use_simple_compound_and_complex_sentenceswdco2.pdfIn PDF document text
    • https://xorizugabe.weebly.com/uploads/1/3/1/3/131398100/66dd0fa.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/wizuluworafid/zegemipu.pdfIn PDF document text
    • http://nanomupoveten.epizy.com/pleco_chinese_dictionary_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/rowawikibatipiludofok.pdfIn PDF document text
    • http://sabajuvarotu.rf.gd/solving_compound_inequalities_worksheet_algebra_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/lomelubu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 5692 bytes
SHA-256: 6da8c19dc494902df5d75d8e5b207e50869973a7169e7afc9114b87f8b1961a0
font_01_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 10240 bytes
SHA-256: 566e0c1ed57f8d1ca9530cf8d895f4ddba84b3a2e796167d647c97b474a00cba

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