Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a7e2827c4260ef…

MALICIOUS

PDF

55.9 KB Created: 2020-12-18 03:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea581ce525e967c9af29af1382c9d6b8 SHA-1: 78f5542fc4a06500929246cdccea5c1c56339a13 SHA-256: 53a7e2827c4260ef92c7d017376aa75773639a8d5037c80ed8410d4afa99fd53
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and a click-outward action. It contains a mass of external links, with one prominent link pointing to a suspicious domain. The ClamAV detection and ML classifier further support its malicious classification, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 55 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://trafficel.ru/strik?utm_term=wayne+trace+basketball+twitter
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/junareluf_bovupiwekonubo.pdf
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/769aae27.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d556c46f-4ca7-486f-8b6b-c57973742192/xititetodoluguwajada.pdf
    • https://uploads.strikinglycdn.com/files/75497ebf-67bd-4650-9c16-c994cc412e4d/technics_sh_8017_manual.pdf
    • https://s3.amazonaws.com/debamijizozexo/98571684529.pdf
    • https://uploads.strikinglycdn.com/files/6e8f2193-e744-447b-8527-0e6dfbab1be0/somesetudorununusi.pdf
    • https://s3.amazonaws.com/sabegokek/lavivufanamoxetekilob.pdf
    • https://s3.amazonaws.com/wegemebufojafak/implied_volatility_excel_sheet.pdf
    • https://uploads.strikinglycdn.com/files/e9f3414f-13b2-4cbc-978b-68600b1cb648/zipevu.pdf
    • https://s3.amazonaws.com/ragejufa/antivirus_app_download_pc.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/94830824681.pdf
    • https://s3.amazonaws.com/betefowubevat/wujatozibubuveto.pdf
    • https://uploads.strikinglycdn.com/files/9f633ddb-bd4a-41a9-aee1-72f64bf0b759/seth_thomas_grandfather_clock_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a86f.bin
ecc7d9ab05f6e1644b5c6576ddee48bf27cc8a15d20a97eb94a3b4d29b023d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA86F 5204 bytes
font_01_sfnt_off0000ba54.bin
a54914b00892448c898cc988033f48a657316715aef92c483e9971a5939c5839		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA54 7304 bytes

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