Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0e8b45a78cd0a1…

MALICIOUS

PDF

76.7 KB Created: 2021-05-25 06:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c50bc4b64e9e40ba25a7f5a73dfd8949 SHA-1: bf85c938de0113b050b4c4375ae635e074fc3d6c SHA-256: 4f0e8b45a78cd0a192d0e655b43035936bcafc730bb863748b761046f884bf91
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=ccna+4-skills+assessment-routing+and+switching+connecting+networks PDF link annotation
    • https://laziboxejebemu.weebly.com/uploads/1/3/0/7/130740401/tugajiga_senedipuse_losuxi_tidope.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/raradufalowokirolivo.pdfIn PDF document text
    • https://zorajifedimak.weebly.com/uploads/1/3/1/4/131437130/jajijo_nozibofugesalaz.pdfIn PDF document text
    • https://zudopawugaweso.weebly.com/uploads/1/3/4/3/134343229/f021f2ee44.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/nafunalilelimun_kawakerud_neleke_furedixagiga.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/muruzukosedeg-vakun-jibipivapaj.pdfIn PDF document text
    • https://zezefikopupom.weebly.com/uploads/1/3/4/6/134686460/3521314.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/5545284.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/f1b895590.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/xuminitopinala.pdfIn PDF document text
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/e2c7d97dacc.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/849ab9d4-9f46-4a15-80cf-184d479541c8/jesofisetabugakivuruvu.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/vekux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc29c8b-4d18-4708-8a8c-1bff0e338b1d/26401833152.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/how_to_reset_a_walgreens_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d22b2c5-81e7-4a41-b0e1-d8fdde4a2872/without_conscience_de_robert_hare_the_guilford_press_1993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5bca79-7619-47c0-8b61-b353e54f8725/19857222380.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/12804222323.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/screenshot_program_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a6c4ee-f232-4ff9-8bae-3e9e9f3d3990/61744774729.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/buxige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac0c03f-9a31-485d-817e-78da4048f4c0/15435659722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa740f0a-b66e-4d6e-918c-25a2ec01630a/jidurumifivulaporenus.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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5536 bytes
SHA-256: 0355d11ab581ce5dafdefe20de4589b856a42e56537d3fcf6a35a94774d3cdd7
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10944 bytes
SHA-256: f61d26039d35dd386a9e8c8b8b882c73f6d3085151bbfd33aaa8a158fd5a908b