Malicious PDF — malware analysis report

Static analysis result for SHA-256 c945274dba0cfd06…

MALICIOUS

PDF

87.0 KB Created: 2021-06-05 15:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f2713463875e18a1c16da8dcb06c6915 SHA-1: 3f8848080facefa5132ac82261be288db415127f SHA-256: c945274dba0cfd066b1a4fbf8ada5f93c309bd361f8cf55194ff2e5de5e66e80
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain 'coretry.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. No scripts were extracted, but the embedded URLs and link farm behavior are strong indicators of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/pbw?utm_term=mod+don%2527t+feed+the+bears+lyrics PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4449789/normal_60b2388ddf09a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5ff92583815f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5ff8178063459.pdfIn PDF document text
    • https://vasaxufunibax.weebly.com/uploads/1/3/1/6/131606743/6604614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fdf3be2a6b75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff4f06e282a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5fdd671222a58.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/32ab40def8e6f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4386851/normal_60b06db10f3ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5fe17ac14e891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_60445ab97c951.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/d5b3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5fc831b985b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463275/normal_6060c0d563295.pdfIn PDF document text
    • https://merejeweja.weebly.com/uploads/1/3/1/3/131381112/40c89ba2d40cc81.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/sosel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mumubib.pbworks.com/f/how_to_make_a_paper_airplane_best_for_distance.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144629118/how_to_determine_thread_pool_size.pdfIn PDF document text
    • http://malamojozag.pbworks.com/f/small_animal_adoption_near_me.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144536490/who_is_the_strongest_norse_god.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/99142554498.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 3776 bytes
SHA-256: ee7b563439c7b01f7db77c3c3a0d8292eec7466044b525df9a221bb117e35e66
font_01_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 5176 bytes
SHA-256: d555f657a9a27357b518d3b97c5869c63147ebbe71f2a678d1349630db510659
font_02_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 13540 bytes
SHA-256: 1f0c8ecdab7cb93ee95bfe4316054a6622e4dc20aa08127729ec23c283b42df7
font_03_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 17120 bytes
SHA-256: 7d24bee7afedc52626af7a051ff63e5d24b49fb77ae37b08ebbf423e48bd8558
font_04_sfnt_off00013dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCF 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71