Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af1b16b6cf71897…

MALICIOUS

PDF

76.6 KB Created: 2021-04-07 21:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7f88e3f3a0cfc25e944342ebe2c1b730 SHA-1: 50e456f30fafce88c9cfd2b87ae1e24a4e31ea68 SHA-256: 6af1b16b6cf7189708bc29d4aec7030a6b18852a42060003de981d2072077691
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/wix?keyword=torrent+pro+apk+download+for+android PDF link annotation
    • https://tikofasej.weebly.com/uploads/1/3/4/6/134615027/1762656.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/kiron.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388050/normal_5fef7d4b5fc75.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/faxuzetuwases_vakaxasuzijeped_jubasu_zibovatuwibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_601e01d118270.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/backcountry_navigator_gps_pro_apk_cracked.pdfIn PDF document text
    • https://sizuzevejej.weebly.com/uploads/1/3/3/9/133997482/2842334.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/edb50a1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_6041965957c42.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/worijux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_600d4416c5d7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_601109c3f26a6.pdfIn PDF document text
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/a2ec93c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_60312186292b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_6012a7906cc31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxewetim.rf.gd/survival_kit_in_a_can_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5083083-747d-4557-b5ea-b2145be9a7ea/pigew.pdfIn PDF document text
    • http://bikumekomem.epizy.com/58597817912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0d8aec-2e98-496f-ab9a-fcaaec3f5315/which_of_the_following_statements_is_true_about_direct_evidence.pdfIn PDF document text
    • http://viwivebobip.epizy.com/bootstrap_table_style_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46800114-9fe6-43a0-b38b-d3cc8ee4bfa8/87372929301.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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 4964 bytes
SHA-256: 161a573caf705083befaa1ec05e0aebdf8fde41093315a0774154f1e4d04b807
font_01_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 11104 bytes
SHA-256: 010c376ae6a6af56132df63676327edda19291ec4e646e316f639d2a213ccb11