Malicious PDF — malware analysis report

Static analysis result for SHA-256 016e54ca651cb267…

MALICIOUS

PDF

79.3 KB Created: 2020-12-18 16:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b92da7471e81a17c0417cc55112afc60 SHA-1: d8334af7522a7c2a599ec4643ee9512998b9897e SHA-256: 016e54ca651cb267917e54f0f510da86450947067540a415efcbfb49bce64622
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to facilitate phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or content-luring attack pattern.

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://traffnew.ru/strik?utm_term=2014+f150+cabin+air+filter+part+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5f8ebad322b37.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/guwazexofe-xujigiz-bixebamaje-wofudejomajub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5fdac5acbff05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377112/normal_5fcac8a670b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_5fbed1e6b0bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fb2a7d09ff30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5f9a85462f38c.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/b5d3d862-93e6-4d63-a998-22297732e94b/a_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232e419b-1611-433e-bbbd-56b25fed3cb3/lebojagujegezeseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1922625c-b99e-4a17-8835-562b01c4f61e/zumolutogez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60182935-f4a9-4aed-9d25-760a64f25a13/soduboxaxirakupekixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d612f4-1a4b-40e4-9913-094dbbbea98a/gobonamigewagaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3969a2-b683-4684-9e1f-9266dba5ee0c/madden_16_coin_generator_legit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac7a79d-0280-41fc-9f52-99fac0a38c34/wavutedu.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5568 bytes
SHA-256: 29ba54c8e0e179e1dc2fec3bf8c32932480a6dfe7e3f5c82bd1dd223e3da988e
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 11220 bytes
SHA-256: 85a11bbcce0730ade81c535a426b74824574d5dfb6bc06f1f8e71db87f8cd5a7

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