Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f229119ec0015c…

MALICIOUS

PDF

164.0 KB Created: 2021-05-29 07:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 988172aeafb41a06fc543260f793e7dd SHA-1: 5116e0ca131922cf321eed3043c0130d40c4fedc SHA-256: c4f229119ec0015c7dd47032047b0ef799a91020855855b39a9aa0b5cec58f1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'jottigo.ru', indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests malicious intent by identifying a link farm on disposable hosting. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score strongly suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jottigo.ru/123?utm_term=chopsticks+waltz+duet+sheet+music PDF link annotation
    • https://munulibur.weebly.com/uploads/1/3/4/5/134508804/guwezumome_zewezepakeb_jezutiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5fc74c6840e1a.pdfIn PDF document text
    • https://kaxizaro.weebly.com/uploads/1/3/5/3/135349404/27169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5fddaf5b2be0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fec1d85bb0bf.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/wagejolukorimed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_60220ac0ec62c.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/xasupupeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_60068a732a507.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/801283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_602b50fa48585.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/12e103a6053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fcda0326dc9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374540/normal_5feb7eddcff9a.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/de49a4c8-c342-40a1-8dc7-5b38bc549f1a/examples_of_social_contract_in_everyday_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7bafa7-03f8-4952-aca8-b6576422da18/86731045854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f23647-5382-4942-bc9b-97472620b554/71654174013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f253db60-5a4e-40f2-b09a-ea4097e78fbd/gufemorojavuwelutova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686c9d3c-4dd6-4ab0-ab7a-1ea539810e43/nefijawof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19065870-b1ce-4cc4-8ae2-c7f0b4ae462a/18328401275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7818a5-f41c-43b9-8277-8302b0724050/78711713983.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_off00024709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24709 5328 bytes
SHA-256: 19c4b27d94f7976165bf199fb93c0bab7d0a1ed46f5e3d27c26cd163210be949
font_01_sfnt_off00025916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25916 13000 bytes
SHA-256: e4a5bd8abce1c17d6da737322be1a3a3b65b25bc71e0b7f684e1446d035e6a51

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