Malicious PDF — malware analysis report

Static analysis result for SHA-256 69759fd1c485a4fc…

MALICIOUS

PDF

112.9 KB Created: 2021-05-28 18:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9f9b16b005ab3bb0bf57cd32360f9e97 SHA-1: 507689142f130c33b41ae45579429e9a53614b11 SHA-256: 69759fd1c485a4fc39f42cacc5ecccd139525fd70175e52ab296aee95e42e9d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://mezovuduw.ru/123?utm_term=fishing+report+tomales+bay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488842/normal_6023768226ae5.pdfIn PDF document text
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/pibizof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_603283fe089e9.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/1bc0c.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/189e7.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/91ce63270df.pdfIn PDF document text
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/kefoxedutusula_kajan.pdfIn PDF document text
    • https://pakujefaf.weebly.com/uploads/1/3/0/7/130740244/30bce0417909.pdfIn PDF document text
    • https://mujavipaw.weebly.com/uploads/1/3/0/8/130874121/zabudanovadufuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5ff84463b3a47.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/8049217.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/diditizekuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_606e6279e70b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_600a4d3cec1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5fdb953d26e5f.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/9b7700b2-545f-4c24-a7a3-5c7ae4d981d1/funufozadozijavisefete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1f2b4e-6e37-47e0-b549-de34c830dc50/remudej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9506ed83-4194-4688-858e-32321f3a542b/majanog.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_off00017bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC5 5432 bytes
SHA-256: 269c594653df869763591b5574a6b1d72c00272dc64a651416d552b37efca1da
font_01_sfnt_off00018e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1C 11204 bytes
SHA-256: d9f9258ae5a6dd6eed44485b0a3d3a5d5552f34a2a032bfff751656280690260

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