Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a6abdcab1be50b…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 07:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7bff0b5b5c7e7a6e6aa309a2d548921a SHA-1: 1621552b5442771a02ba9ded6e8800a5be137440 SHA-256: d7a6abdcab1be50ba6ac2e20c423ba99207f90f02c194bae4bec30277134eb26
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://crophysi.ru/strik?utm_term=nombres+de+la+mitologia+griega+para+hombres PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470960/normal_60245cb80b5e1.pdfIn PDF document text
    • https://cdn.sqhk.co/panufarubel/hjbHRjj/rolling_colors_stones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_600c61fa275b3.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/Hgdihua/32504043160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_5fe63757a86f6.pdfIn PDF document text
    • http://lajulufubugo.22web.org/81742369548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_6038edafc70d9.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/fezixopubi.pdfIn PDF document text
    • http://gitilapen.66ghz.com/kevadub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476595/normal_600081d4ad586.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/9260199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_60465b8326477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472204/normal_5fcc990be9b1c.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/tudukiwoxiwozupop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_604477ab54e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_6018895f88b12.pdfIn PDF document text
    • http://pasasem.iblogger.org/texas_state_comptroller_annual_report.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/6250e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disoluje.myartsonline.com/kepinewujafetoredizez.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/brown_v_board_of_education_1954_summary.pdfIn PDF document text
    • http://livutogugusal.rf.gd/tolofadogowuwanobovodax.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/denosiker.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_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 5484 bytes
SHA-256: 2f5ffb3a69d860b1223a4bf71d91d0456d74b59267535df67d113455899afc90
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 12116 bytes
SHA-256: 323e3ed6caf801389d9d6c14c5eaa0397c59ac2f944950ee9e85223ab3be0e81

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