Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78de986244631bc…

MALICIOUS

PDF

79.9 KB Created: 2021-01-01 22:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e196e20138f3c95246cb9ba1640d5c09 SHA-1: cf6c2a5fe425b03b3150603e9d763e633988fe2e SHA-256: a78de986244631bc6a06f4d99d8ec3071fc7c07c9e3260e3f53fc6b80e3d743a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The file contains a large number of external links, suggesting it functions as a link farm or a phishing lure. The primary URL, 'https://trafffi.ru/123?utm_term=darts+cricket+rules+pdf', is likely part of this scheme to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is indicative of a malicious document.

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://trafffi.ru/123?utm_term=darts+cricket+rules+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5fa9ecced1a29.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/6876311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5f9350970a39e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5f9abef0c389b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_5fb2f5b3345ee.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/zotawexivekegeg.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/cgjhdD3/best_online_slots_free_spins.pdfIn PDF document text
    • https://mosutija.weebly.com/uploads/1/3/4/5/134502389/7935768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f88c84bb99e9.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/ifjfhhw/bogukifenevumetipob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5fc3eb36e0ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499622/normal_5fad7bc163d7f.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/jufowokedunod/catalogo_truper_2019_precio_publico.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/89708648042.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/83684885715.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/start_formal_letter_with_greetings.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/37362428257.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_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 5212 bytes
SHA-256: b984ab45500aba6efeb4f3b8e7fbed7aa66b2097cb6acfacfe0b5d9376c34c83
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 10632 bytes
SHA-256: beb17b8307f1d6c49e41cedb28c49cabe36cf5f9064deac0740fed3f52fbda46

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