Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b04595a2ff3fae0…

MALICIOUS

PDF

74.4 KB Created: 2021-04-03 18:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c6983799edf6b2f791eb4a2e6305dda SHA-1: dde11aa571cd72b4bc92cf74b1a1bc2a1594b864 SHA-256: 5b04595a2ff3fae011835fc7424a781e47fbe1b65b8566d678bec51f3461ed61
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. This behavior is indicative of a phishing or scam campaign designed to lead users to malicious websites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=capitalism+a+love+story+movie In PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/9362603e45.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/4572569.pdfIn PDF document text
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/af8f5300.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/6814898.pdfIn PDF document text
    • https://sirefofaf.weebly.com/uploads/1/3/4/5/134523631/bejojodixifa.pdfIn PDF document text
    • http://lawyer-consult.ru/17931157347zhj7h.pdfIn PDF document text
    • http://discovljzg.fun/vexuzadutoxoxavanrjx3l.pdfIn PDF document text
    • http://mishabelle.ru/26827147537l7qlt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_6024baa637b57.pdfIn PDF document text
    • https://jakineporop.weebly.com/uploads/1/3/5/3/135302356/2921449.pdfIn PDF document text
    • http://weragefiz.22web.org/que_es_bulimia.pdfIn PDF document text
    • https://zomutelisofo.weebly.com/uploads/1/3/4/7/134712892/murodow.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/7cdec.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/xolafate.pdfIn PDF document text
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/zorofazafopido-nonir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6040667f4b8d6.pdfIn PDF document text
    • http://jewumod.22web.org/alessandro_baricco_omero_iliade.pdfIn PDF document text
    • http://lavkavkusa.store/womosefiulyiq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxebolinos.rf.gd/83838386238.pdfIn PDF document text
    • http://totefejat.epizy.com/eyiz_listesi_eksiksiz.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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 5032 bytes
SHA-256: 5e9ecdaa142ca6818ba0956214163a313aaf188b491a1d748d01a80cda520233
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 11036 bytes
SHA-256: 53a68dfb42d7b0f47e2bd37b479e98878f6c0bfbd577ca464168061459fe4d39

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