Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ffca6e5e10b609…

MALICIOUS

PDF

66.9 KB Created: 2020-12-24 21:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6e92b41ce345aff6894312cc2781db07 SHA-1: 9ce62f535ace9070d8659136416c6e98d854f3de SHA-256: 51ffca6e5e10b609bcf5df5f02157089169f1c3b914571a4a0f7cc8218a382ea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, with one prominent URL pointing to a site related to 'hd wallpapers', suggesting a lure. The PDF structure also indicates a link farm, further supporting the malicious intent of directing users to potentially harmful external content.

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://trafficel.ru/strik?utm_term=hd+wallpapers+1080p+for+pc+pinterest PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fe33f6e3dfbd.pdfIn PDF document text
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/2b12b1dbdec969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_5fc0699869b44.pdfIn PDF document text
    • https://didonomomosizol.weebly.com/uploads/1/3/4/8/134892758/jizejuzided.pdfIn PDF document text
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/22cb610158.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/8374486.pdfIn PDF document text
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/9449804.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/gumagabu/tomipikumatoravekeru.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/fitbit_connect_app_download_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/fiske_guide_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccd84c9-eaa8-4f1f-be18-474c805ea576/virtual_blood_type_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88fe8c8-b669-4f6c-8775-95f630c9c828/xepifelimabese.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/fogigazekanojivugigisi.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_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 5592 bytes
SHA-256: ef3f1edf2fa60cc785e1ff8efaeef2a2923d4ebe0997834dad0ec551c50986e8
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10608 bytes
SHA-256: c630e3233f55b4b1c412f0802d65388a3fb34e3f4daac3f405c13d7c4b9c34a0

Open this report in the interactive analyzer, or submit your own file for analysis.