Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bf876e1308acc6…

MALICIOUS

PDF

69.6 KB Created: 2020-11-16 18:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 53f52bcad2a8502bad593268f0f932af SHA-1: 1ae90cfd0a1ffc6e60f523545c855afa1dfb692b SHA-256: 66bf876e1308acc6c3e630fa6557d49bf779e3867bcf6878c0c2dbb13b4afb22
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/123?utm_term=stampy+adventure+maps+with+squid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453102/normal_5f9f3e9ce31bb.pdfIn PDF document text
    • https://kapomubevobi.weebly.com/uploads/1/3/4/6/134681937/rivexow-duvuwamanizib.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/powuwenalapufaxusun.pdfIn PDF document text
    • https://xodunutejoxefis.weebly.com/uploads/1/3/4/4/134476009/bevix-relemopunufobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5f90a27c6142f.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/tozonojujonosejuxow.pdfIn PDF document text
    • https://sozetodu.weebly.com/uploads/1/3/4/2/134265488/2297487.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/gupawupigawono/banorte_movil_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/all_hindu_holy_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b84b7da-7927-4b84-ac7e-dc3c682a3b61/82856101146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0c6904-61dc-4576-8fce-6b32af0ff7ae/duserixij.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/web_tv_live_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/58751257106.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/fikoliterukalamoraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdcfd7a7-1356-4d70-a057-dd5e12cec9c3/galanof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71d71d4-f5f5-4f13-98e7-f2077de9125c/hulk_wallpaper_for_pc.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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 5648 bytes
SHA-256: ea917407b48353bc74a70aa867462713ce79ba07ccf5078e6575d1d27ab231d2
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 10212 bytes
SHA-256: 6c1206be7fb359d375539cae6a5fd7b8d79a137f8fbc71b73cc8351262ae6feb

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