Malicious PDF — malware analysis report

Static analysis result for SHA-256 898f80b3a81c6e9e…

MALICIOUS

PDF

63.4 KB Created: 2020-12-01 15:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 751e99e59566729d33848c831cd1b9fb SHA-1: 04c72f3d63d3a3391f95c21b884492e6be65ef2d SHA-256: 898f80b3a81c6e9e042432e3e081b8bf94987f9920944b80d08670c00c873c47
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous external links.

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=rodan+and+fields+unblemish+mask+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5fbcd21556b4f.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/wunaririfokuvowadape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5fb7de69f1658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5f9e2804e3897.pdfIn PDF document text
    • https://letenusesek.weebly.com/uploads/1/3/4/3/134310332/tomerolatigaje-tiditusizijales-pupawefavenavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8e6a1d0df98.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/b68b9aa0870b53f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5fc55a08cccfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5fc3621fdadeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_5f97e64973ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5f8fdc1876078.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/e5e36aab-2357-4580-bac7-0907e0646e0e/newanineluliravivesufafed.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_off0000bae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE8 5512 bytes
SHA-256: ec0a4906c6f493e289e5d2856c94f4edfbec5a7fe17292bc598a789ef6d53a85
font_01_sfnt_off0000cd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 10336 bytes
SHA-256: 521ad4d8bf512f18d3581659836943c12083912e4994aa9e10dcdd31339536fb

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