Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdfa3e1bd78bab8…

MALICIOUS

PDF

82.8 KB Created: 2021-03-27 22:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 284bf6900a5fa7b02f57d04c7962de70 SHA-1: be67b4b43f676b8535f45e893cc03ac883241547 SHA-256: ecdfa3e1bd78bab8cc8663fc10379cfcf444aa71a9bdf54d5c4aef8cc84ae077
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=easy+uke+chords+somewhere+over+the+rainbow PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381534/normal_604fea106c3fd.pdfIn PDF document text
    • http://teachersaid.fun/tft_9._22_item_guidektxy7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_602f3352468e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5fedd3efe1456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fe4d37722976.pdfIn PDF document text
    • http://yewes.fun/kexemesemunanor5md9w.pdfIn PDF document text
    • http://premiumpornclips.com/84016382565nrakf.pdfIn PDF document text
    • https://wikumegi.weebly.com/uploads/1/3/1/4/131407968/42b6bfbcea3e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_60339ab27c8ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446502/normal_6039514814fa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fe41e36503e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5feec37b64627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_6035d117735cb.pdfIn PDF document text
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/dilelosabavikakari.pdfIn PDF document text
    • http://lg-supportteam.com/poweredge_r440_rack_server_datasheetti55e.pdfIn PDF document text
    • https://vekukedabil.weebly.com/uploads/1/3/4/7/134710008/9548832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fd9a1cb2c84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_60405f61e0335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_605f6c5fa531f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_5fe89d023854a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_d45b04776d444b158677dc5f8269eb7f.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_fed8ae013c1d42c2bc636c85c81822ef.pdf?index=trueIn 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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 5444 bytes
SHA-256: 857029783da4afa7c8a56fdf21ca859c0bfeb027a7fb0e2e7d5b62983c35ea9f
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10756 bytes
SHA-256: d1c0cadd2dbc6e9eb17d5e218201e7c5861672a8a97d63bec4e49722958e34fd
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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