Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc99a2e382837c8…

MALICIOUS

PDF

66.9 KB Created: 2021-06-14 02:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3fda123fa2f3ffc062c696f796fbd6bd SHA-1: 10348a63ce0b4f78c270bedece69b01eb41b9f67 SHA-256: afc99a2e382837c8d1406c8ec2c06776558d2080e7d0a040942756e8b6c5063b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging an external URI to 'infrive.ru'. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The embedded links and the nature of the heuristics suggest this PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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
  • 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.
  • 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://infrive.ru/pbw?utm_term=august+2020+calendar+template+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5fd0e1db1aaf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_6041228984e28.pdfIn PDF document text
    • https://mewibanomerazam.weebly.com/uploads/1/3/5/3/135348120/kebifezif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_606a8b80bf71b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485698/normal_5fdd63b6236a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_604d2388a7961.pdfIn PDF document text
    • https://rigoxetevub.weebly.com/uploads/1/3/4/0/134017132/tinilaxepotogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_6023b939962c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_601b82078586f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_60692709ded31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakebimutep.pbworks.com/f/37378335532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/530e990a-fad1-4585-9261-78c4e9dff26e/how_to_connect_brother_mfc_8710dw_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2161a666-e887-4b16-89e2-3c5b94bdfa63/city_mini_gt_travel_system_car_seat.pdfIn PDF document text
    • http://mutoteja.pbworks.com/f/wuvin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d394e2-706c-4fc2-810b-a48d9fe43f87/79275900621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f737db97-e48e-479a-9a90-dc33ecc8ceb8/marie_de_france_chevrefoil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62516add-47ec-4172-a978-78a9f3bb6388/fupulonejekujo.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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 5748 bytes
SHA-256: c4445835d81d6ccc0f059c907727d304775f0badc788e2177fbe16b401c3e82e
font_01_sfnt_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 10244 bytes
SHA-256: b6f37bf34887e0fe240c013fe5b848b110930c58a0efee2da61d21aba2d3ad04

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