Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdf7b105d842151…

MALICIOUS

PDF

91.6 KB Created: 2021-05-28 12:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dd9f003e785ecb070c522376712de0e4 SHA-1: 7a2ba63fde4522c0cd89201ec2ad102a372450ea SHA-256: 3bdf7b105d842151bbe8a975087022de7c2ebc239ebe376658a1f9976a5de8d8
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 designed to lure users to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the presence of numerous external URLs points to a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=the+great+gatsby+figurative+language+chapter+2-3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384026/normal_5ff06d89ae266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390329/normal_5fddca9dc3a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_606ca6901fe4f.pdfIn PDF document text
    • https://fawukudaboguris.weebly.com/uploads/1/3/4/3/134353338/neregesu-morokebomusoj-gozamozax-bolegavujobumuz.pdfIn PDF document text
    • https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/sefewo.pdfIn PDF document text
    • https://garugufalavul.weebly.com/uploads/1/3/4/5/134507034/899d51bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_60674306df75f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fee995d09ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_603c148c702c0.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/8eca14292e1502b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394062/normal_5ff62994308b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502188/normal_5ff64e2120fde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5fc7e203634c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_602b3f6f434a4.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/7589426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5fda734dbe4cc.pdfIn PDF document text
    • https://degodowaserujes.weebly.com/uploads/1/3/4/4/134494515/fulovozaneruka.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/xopasodap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5fd82b84e42aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5fd38cb1802bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1becae7a-1cab-4e04-abdb-6160c5c81f97/14900300946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa61e94a-af3a-41d4-8637-94db20fb0a67/how_to_reset_my_keurig_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c5622d-6dc3-4a7a-a365-a4f7b8f10435/tamiya_king_blackfoot_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f9bfe6-c046-4e60-91f8-c90dc098a919/plant_pigments_paper_chromatography_lab_results.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_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 5856 bytes
SHA-256: 47fada0a6f38e9fbb4624be7d0efd30b049a7c88937d09177b7dfcd3718b2c21
font_01_sfnt_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 10660 bytes
SHA-256: c67b8cdca1b93bbf6e998c286dfae51d9bcf807a6ab7b2ebc471368256bd4ec5

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