Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efdf05f2b732689…

MALICIOUS

PDF

92.0 KB Created: 2020-11-17 06:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9ce5bad5d3901894fd4c3484c17d0f59 SHA-1: 21a2582210becedb3168d1f7c1fec85b298e3c03 SHA-256: 0efdf05f2b73268997dd108884e69e02411a2de458a73ef9b40489797e230a76
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-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://traffset.ru/strik?utm_term=emily+sims+magic+kingdom+mamas PDF link annotation
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/bc56b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5fa708181a67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_5f919c27d3e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fb340a1ab5fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5fa86fbc38649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5f953acda331f.pdfIn PDF document text
    • https://dudumopovidin.weebly.com/uploads/1/3/4/3/134308156/a6fdc95856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5fb25f2d267bd.pdfIn PDF document text
    • https://warasogufav.weebly.com/uploads/1/3/4/4/134440103/jatubifiligogus.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/7033143.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/2532780.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/pajeriramal/filemaker_pro_11_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/jefifavufizutew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d404322-f871-482e-8542-62fe4092ee2a/download_abbyy_finereader_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d140e47f-58a6-4a08-8796-8d4ca070e9f1/64618842483.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 5284 bytes
SHA-256: 14956369fe3aa29ca582e8b54ddbff40863c0618cf430906dbc76d473777fc38
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 11396 bytes
SHA-256: 6a20a8ed57fd16a8d3b8b3e14ede47ed920d94391084d698ad9a25fb8006e817
font_03_sfnt_off00014ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE9 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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