Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4079fd82c752cca…

MALICIOUS

PDF

67.9 KB Created: 2020-12-22 19:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 86f30896cc7da03215645c8f711da944 SHA-1: 9f5447aad49f5f3ca59786d3c5e99d66bdd0eb2c SHA-256: a4079fd82c752ccaa34481362b69c8605b42117e56613178ae7fc85570a6fc21
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external PDF links, indicating a link farm or phishing distribution mechanism. One of the embedded URIs, 'https://trafffe.ru/strik?utm_term=world+record+hammerhead+shark+boca+grande', suggests a lure or SEO manipulation tactic.

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://trafffe.ru/strik?utm_term=world+record+hammerhead+shark+boca+grande PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5fb97042a3a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_5fb47ea414309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fb5d0fa3bb1e.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/9369973dfc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_5f97ab0b22d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_5fa2bb530d580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f8be6679c72e.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/7489670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5fdb91cd1b29c.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/gupuso/indian_food_calorie_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a20761-7c60-408d-b01d-3a546c5eb44c/lupugowijixenupepem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4fbeb5-ee76-4c75-aafa-871bf46ed816/pegoxuzul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a44adf-19f6-4142-9cfd-9099ad900513/60919616191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a546b03-f8a1-40d2-8fe8-fd6cb7f64209/sukisidofuwixogabewufuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8826ee7f-c4ac-4666-8181-505f07c1523f/87708430622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aec6817-88e1-479b-8be5-e3af61063242/99556725263.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/94725265951.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_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 5568 bytes
SHA-256: 04c89652e8e596248f524a0abbebedd17828aefa25f5abd78dbc8819a23cf432
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 9752 bytes
SHA-256: e08d52d58eb2ac95abdc6729ac31da6bbe7e3feee8e4888bb7b3c482cafcb868

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