Malicious PDF — malware analysis report

Static analysis result for SHA-256 251663fcd2646e92…

MALICIOUS

PDF

74.4 KB Created: 2021-05-22 08:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9cce7f21aab7c9adea2e71cc459fece0 SHA-1: b23ed9ed87a089dc41439749975cd72e3479d944 SHA-256: 251663fcd2646e92d8a19e1e67adce45a17cf318e5a19c77eb25e47c6f531f6b
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 0.9999

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://nipisod.ru/strik?utm_term=novena+de+aguinaldos+pdf+para+descargar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401982/normal_602a2c661fbbc.pdfIn PDF document text
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/4746532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469631/normal_5fe051628c6e8.pdfIn PDF document text
    • https://wokuzavewa.weebly.com/uploads/1/3/5/3/135339714/7214065.pdfIn PDF document text
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/949165.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/9846589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_6055144dd737a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_601ac2a5911a5.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/limejikiv-molopik-fukafifeg-sedotarik.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/bamin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5fe00f3d49311.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/zutagaw.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/7b30cd9d-07ab-416f-a222-9f019ba7b450/defiant_security_light_bulbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f779d4c-57aa-48c1-9382-2dba88b514a0/xuniwuwoxena.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/safozatenopopopa.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/56779632626.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/clash_of_magic_s1_apk.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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 5352 bytes
SHA-256: 6c968151e0dfe340e41c2da05e4053fe0e2de4555d9819ee88bd709cea8e8ffc
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 11820 bytes
SHA-256: b329fcd80063f4b925e7cb9afebf24ff8af66ea57620f00b4f59b86fcfba83c2

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