Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5efd4a59cbb2520…

MALICIOUS

PDF

67.2 KB Created: 2021-02-18 07:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17129b6423b3041c862910b47097878d SHA-1: 7dec5807db3633f0d0a22b9154872ef52854d9e6 SHA-256: c5efd4a59cbb2520dc242b9ed42522777eab6264462779131dafd62cb9c75b66
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or SEO-spam related domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The presence of a link related to 'Navien flow sensor issues' in the document body, combined with the ML and ClamAV detections, strongly suggests a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wb?keyword=navien%20flow%20sensor%20issues PDF link annotation
    • http://raisinslabs.club/longitude_and_latitude_worksheets_2nd_gradefy5ne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_601f0b95c7455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_60161ba67bf33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_600d6b2a0dd1d.pdfIn PDF document text
    • http://italdom.fun/typhoid_mary_anthony_bourdainkkxh8.pdfIn PDF document text
    • http://thiswaytovogue.com/pejujavasigapugovupbpamk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5ffc09be27ff7.pdfIn PDF document text
    • http://tb-films.ru/77231404663d5dzw.pdfIn PDF document text
    • https://rizapomon.weebly.com/uploads/1/3/0/7/130739727/f20d6f3000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419193/normal_5fface811bff0.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/mesixadelomomo/suara_burung_punai_gading.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/zedoxadarelep.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/63194566231.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/zopesivof.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/danny_boy_sheet_music_with_chords.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_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 4880 bytes
SHA-256: 4d37a114e3aebc249b9a3d9994f056fea6f9c640626816e4b92b87a3f29c8b8e
font_01_sfnt_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 9728 bytes
SHA-256: 740fa3db642cbad01d80384824b836567771361d919e28f5e1793d7fb9854a75

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