Malicious PDF — malware analysis report

Static analysis result for SHA-256 228a137711c125ab…

MALICIOUS

PDF

74.3 KB Created: 2021-06-09 02:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a5b2747d3d278636c99b65fc796de1ce SHA-1: 807d90fcf17e145db7a4fe5ed223472c2de4b378 SHA-256: 228a137711c125ababaf316b78c7289adda2b95797aa6424ab88183517cb81e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://crysiq.ru/pbw?utm_term=old+movie+songs+in+tamil PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5ffe9c9fb5f26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404976/normal_60062b6dc2b7d.pdfIn PDF document text
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/7213527.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/e77d5.pdfIn PDF document text
    • https://nojevuxosat.weebly.com/uploads/1/3/4/3/134357696/9366689.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388841/normal_60b734ef01a00.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/sufirukap_bogomofun_zesiwuva_jujovasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_601d2d32cd015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_60654625649f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_6022cded573a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_60bb85fb87e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_6052678d6f209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_604cd121ca633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fcc8a1b3293f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_604344542fb2b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4405654/normal_60b5f2f6e6b44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144416988/festival_internacional_de_musica_y_danza_de_granada_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f97b0e-8230-4844-9ddd-49827e43890d/why_does_my_ex_not_text_me_back.pdfIn PDF document text
    • http://vowijeve.pbworks.com/w/file/fetch/144775287/tufusirovebafenunewetubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1627bc8-48e2-4a7f-9f3b-ec376d78b873/gemakiwekugizalaz.pdfIn PDF document text
    • http://gurilotav.pbworks.com/f/add_yahoo_mail_to_outlook_365.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/how_to_use_digital_blood_pressure_monitor_machine.pdfIn PDF document text
    • http://marutipug.pbworks.com/w/file/fetch/144421368/bleach_brave_souls_hack_android.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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 5136 bytes
SHA-256: 1dcc121037dcb854f591049480b38462455fc88048d35fed4bf4ae9639fc29d9
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 10888 bytes
SHA-256: 36b9734f85dd968cb494e9aaa701befeb9ea9304946873424cc1b0c6bd932fa8