Malicious PDF — malware analysis report

Static analysis result for SHA-256 541bf06f95cb6cf1…

MALICIOUS

PDF

60.3 KB Created: 2020-11-25 19:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 59f8488b78b2676b4106c6ac4ccb3d11 SHA-1: 9078ade9914a982c3ce3a9948f6b24337f64591e SHA-256: 541bf06f95cb6cf1921ea94d89d4b82a22f766ede7f16426c4ff6fc9bece4165
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 0.9996

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://traffnew.ru/strik?utm_term=mcallen+isd+calendar+2018-19 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5fabcf0eeb819.pdfIn PDF document text
    • https://gilezetekeno.weebly.com/uploads/1/3/4/5/134596926/5a5b0b33cf.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/1289846.pdfIn PDF document text
    • https://nepopuzabigeju.weebly.com/uploads/1/3/4/8/134856357/roripudevip_nedokegekijujob_gogowosevut_muxevawujiw.pdfIn PDF document text
    • https://wafugavewe.weebly.com/uploads/1/3/4/3/134369352/6b8c85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f92581079446.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/bb8118b76040e48.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/jiguwuzobozobaz/saga_of_bloodninja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ad0658-15b9-4e3b-8094-c3c10c7bc133/4806873455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df28052c-c4de-4178-9519-60b54e5a00bb/mepetume.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/movie_maker_app_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761d3cc3-0dec-443e-8828-99c18ecbb85f/mucoid_plaque_master_cleanse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671e61ca-9736-409a-9db6-fbb4b7a3a159/najaduselinebiguwelogej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699c186a-3487-45cb-9e6c-3280dbb86fd1/dubigozumu.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_off0000af51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 5648 bytes
SHA-256: 0d6eac2369ee9f604ff6489aa57c9296badac74b4bfd85e0b775eb566f7167f5
font_01_sfnt_off0000c2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A3 10120 bytes
SHA-256: aa23368bbaa880bfbb3333e05c0dd507dc3a3b0aeee3d344b8c8ddea86442739

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