Malicious PDF — malware analysis report

Static analysis result for SHA-256 d321bb9408c184d2…

MALICIOUS

PDF

70.1 KB Created: 2021-02-02 18:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fd33b08848e15824372e4e7a86437739 SHA-1: 29b902cd38a9b57cb2ed0ad644436d7964fcddfb SHA-256: d321bb9408c184d23ebc773064850e8f27280985a8d432c071c05660f38db529
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains or services like Weebly and sqhk.co. The document's content, though obfuscated, appears to be a lure related to "sheet music," likely to disguise its true purpose of redirecting users to potentially harmful sites.

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.
  • 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://leonvi.ru/aws?utm_term=grandstand+theme+sheet+music PDF link annotation
    • https://ruponijipatom.weebly.com/uploads/1/3/3/9/133999380/3740b40cdfb26.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/bjjgjB5/futozepivan.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/9d07f4.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/8DDjicK/garusalirejogoxevazufona.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/hff37gc/judewunasukajarirunejaw.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/ef0f0304d4e0d9e.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/b4jgTgh/all_grail_knight_cosmetics.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/weveboga.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/hgcJZje/vusafavonoxijifixozu.pdfIn PDF document text
    • http://pakisonuzaruwav.iblogger.org/anarkali_malayalam_full_movie_free_cinemavilla.pdfIn PDF document text
    • https://cdn.sqhk.co/japewaturu/gblheeC/world_war_1_map_of_europe_1914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebozobab.epizy.com/annotated_bibliography_example_apa_template.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/44909190538.pdfIn PDF document text
    • http://gozipoxux.rf.gd/kabozukevamixekuxixom.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/64731686450.pdfIn PDF document text
    • http://firasakujataj.epizy.com/69939091835.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 5176 bytes
SHA-256: e83ffec35f680728d91cb3a70cd2d2f7cabddb9e43134878264a623a3bcf6088
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 10424 bytes
SHA-256: 2603264575149ff2fced492b9fea61fe75d1c5ccba15af5829980d3e9e86598a

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