Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c82a2844a77fcc4…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 17:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8549751b53d7b4623a8be5680a99a2ca SHA-1: bc15df5da60730d81b19f03492788bb75c3604c2 SHA-256: 7c82a2844a77fcc4f1e229fd997468bf3dfbf1f101ddcaf33753acba438ca49f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=apush+period+1+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383568/normal_601b3d4a7a68f.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/dKgcbKR/word_swipe_pic_level_74_answer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5fdecc05049bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_5fe90d1702d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_60269ac4d5271.pdfIn PDF document text
    • http://kumorafeg.iblogger.org/gijup.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/qhggi4M/moweter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5fced3f621cfc.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/a_68.5_kg_skater_moving_initially.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_60159cd7045f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6046c6c40bbc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_601a2c617908b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_604d446ac3237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5fd9e9d75d32f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16efe879-5cca-4794-93d0-146bb5b7568a/xipebojovuz.pdfIn PDF document text
    • http://zikenonuto.epizy.com/pagaxesolubivuvizim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6a2464-ca74-4ac2-acde-c2a091d3c1d9/bafisafegut.pdfIn PDF document text
    • http://mogorir.epizy.com/learn_korean_free.pdfIn PDF document text
    • http://nufapuruwibixi.epizy.com/87246814295.pdfIn PDF document text
    • http://zanulewetadom.epizy.com/80252694451.pdfIn PDF document text
    • http://fezexebu.rf.gd/lagu_waktu_yang_salah_matikiri.pdfIn PDF document text
    • http://xovuxeke.epizy.com/how_to_use_kangertech_evod_pen.pdfIn PDF document text
    • http://pafafobovixezat.epizy.com/28935059046.pdfIn PDF document text
    • http://pupusebeleba.rf.gd/ginifivavafefebubab.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_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 5024 bytes
SHA-256: f125ad564732d07beea34d2655115637aa6cfebdfd198a6cc00868d16731b654
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 10652 bytes
SHA-256: bc49d006141c253882c12f99b66c98c5f5f4e4f767d50859bacd996c7d1c84fe

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