Malicious PDF — malware analysis report

Static analysis result for SHA-256 70af558ce0ef5927…

MALICIOUS

PDF

67.4 KB Created: 2020-12-27 09:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bb3b478029a8a6b9a119d4f2b6287591 SHA-1: 487853d20183f8353e21c4f1481639f4c9ceccae SHA-256: 70af558ce0ef592735e079048a92dda96b94dc354c39ca27f50f0aa0e7aef7f9
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 0.9998

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://traffset.ru/aws?utm_term=arteriovenous+malformation+behind+eye PDF link annotation
    • https://cdn.sqhk.co/kuzosexiwugu/Rzshhec/21765561410.pdfIn PDF document text
    • https://pemugaladesav.weebly.com/uploads/1/3/5/3/135307247/e7ae9e1235c.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/8ccfb56e84c304c.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/8607847.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/5093791.pdfIn PDF document text
    • https://gumikixinugud.weebly.com/uploads/1/3/4/8/134864359/xorofolimos_mogugexopebume_fezezuduw_filudapofulip.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/97474aa8-bfd9-4f6a-8dd5-676cd067bdad/besoxawafumumimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cc5d9d-882b-4d95-8fdd-9d46d0ec268b/desmos_teacher_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e0d1e9-8bae-425e-8691-249d051e2791/95911586788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4600a75-a3f2-4840-871c-84585c74ed21/drone_pilot_jobs_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1858c3-5b73-4926-90f7-9e87071540f1/kofulira.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/refofurosu.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_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 5436 bytes
SHA-256: 84bf925fa7da909d424c06ce7e2640bc956bf1660dbae00922cc46d836452d99
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10208 bytes
SHA-256: f7ce5befdbc402803711f35e62e5d6b133c7135ea776c85752f9896844fe8d2c

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