Malicious PDF — malware analysis report

Static analysis result for SHA-256 4430e16db1b65a01…

MALICIOUS

PDF

82.6 KB Created: 2021-05-21 11:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1731060b5c2c59484c13d690e12ff902 SHA-1: 04c199ed8220642ec2d4f09dbd7036b06b53afab SHA-256: 4430e16db1b65a01a5e6c69a1b5e48e287101fb59b93059bb54ddd39ca3ab765
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document contains a lure suggesting a fake invoice or payment request, combined with a password-protected archive hint, which is a common tactic to bypass gateway security. It also hosts a link farm with numerous external URLs, likely intended to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://golowaki.ru/strik?utm_term=dish+movil+gratis+para+suscriptores+registrarse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384461/normal_601514ed51d27.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/7c8e321469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_60621d50c5603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_6038fc340d9a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5fcc99a44fabb.pdfIn PDF document text
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/milujarawapej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_602e42687f3c0.pdfIn PDF document text
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/16ccfcf.pdfIn PDF document text
    • https://takoremitivo.weebly.com/uploads/1/3/0/7/130738963/wupodomozizutew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fc738d4306c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_606beaf73c52e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_602b24228679e.pdfIn PDF document text
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/mujowisadozowag.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/zewenotage.pdfIn PDF document text
    • https://sapefita.weebly.com/uploads/1/3/0/7/130776655/f3de4d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60214f8f2a7eb.pdfIn PDF document text
    • https://nizufijaduwetep.weebly.com/uploads/1/3/5/3/135309937/popilutefopano-bojijimixim-wesiko.pdfIn PDF document text
    • https://pameduvexeligim.weebly.com/uploads/1/3/4/5/134579292/629868.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/dudurat/letter_to_self_template.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/riwibojigigasu.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_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 5408 bytes
SHA-256: 70250487455675f1bea4292f4bf040947e556569fc9788d297d7147a85b59972
font_01_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 12272 bytes
SHA-256: 894644835c903d8f3343f6ad10b458c3866e07330cd28eb86096dd33e0f825e6