Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc74455626157e1…

MALICIOUS

PDF

65.1 KB Created: 2021-03-29 22:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec5765a98e89b88dd904d598da96dcce SHA-1: 5d941b384199a86e623b56b6c01c288d2b3e32f2 SHA-256: 9dc74455626157e1d04d74194830e3a47d3a37956f513379613fdfef1deed78d
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 0.9997

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://crophysi.ru/aws?utm_term=how+to+reset+carel+controller PDF link annotation
    • https://danivuvi.weebly.com/uploads/1/3/1/4/131407625/zuzudamuluxeboz.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/vibepavezetuwoturukig.pdfIn PDF document text
    • http://auth02mobility.com/beer_s_law_lab_answer_key_phetoze8e.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/5795002733.pdfIn PDF document text
    • https://gaxuzuwe.weebly.com/uploads/1/3/1/8/131871814/1562214.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/7981295.pdfIn PDF document text
    • https://rituvusuxokit.weebly.com/uploads/1/3/5/3/135300238/kafal.pdfIn PDF document text
    • http://muwikobifeke.22web.org/zuvomufagunudotufivi.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/8223430.pdfIn PDF document text
    • https://foluxodemebomo.weebly.com/uploads/1/3/0/7/130739593/zugunomime.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/79061312520.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/titazaxigex.pdfIn PDF document text
    • https://pesukiziguz.weebly.com/uploads/1/3/4/1/134108741/baxepunusowudaroz.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/61961913857.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/pobawamedug.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/cancer_de_intestino_grueso.pdfIn PDF document text
    • http://axecheat9.xyz/what_is_the_best_bible_verse_for_healingtutii.pdfIn PDF document text
    • https://vaferevipesefur.weebly.com/uploads/1/3/0/9/130969420/75f876404e870.pdfIn PDF document text
    • https://vajepixujilujed.weebly.com/uploads/1/3/4/3/134331233/192775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masusoxowep.onlinewebshop.net/javajurelexisisevafut.pdfIn PDF document text
    • http://kanabobexodu.epizy.com/how_to_check_ink_levels_on_hp_printer_6978.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/64230938500.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_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 4848 bytes
SHA-256: dbb453a7d1f36718363f9d282e45fe012b624633e5b81173f60c6dcbb3aa49fc
font_01_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 9548 bytes
SHA-256: d715be213422c92d7b4403086f05829c28ec351704f082c0b72e43f64e48e39e