Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af46546272697fd…

MALICIOUS

PDF

74.1 KB Created: 2021-06-13 02:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8b1cb8fc051e5f823a378e1fabc0c709 SHA-1: 6c3d64d295d2c80b7b5417b71066082bb9882823 SHA-256: 9af46546272697fddda8d4ba832f542bcf43aff44ed125643ee8430e2a38e0b6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=square+feet+into+square+meter+conversion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368492/normal_6030363a858b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_603c3025ae5a8.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/wimikowad_mobimamoxef_vetekafalilofam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_6022243b64ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_606123f28062e.pdfIn PDF document text
    • https://piberarejini.weebly.com/uploads/1/3/5/3/135332679/2a80a26dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_60600909a2f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_602aeddcc634a.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/ralalusilobed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_601ed550e35cc.pdfIn PDF document text
    • https://zizipidefogin.weebly.com/uploads/1/3/4/8/134852386/19658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_602482d46351a.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/balar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_5fd66a370d884.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/9426128.pdfIn PDF document text
    • https://lupofavegevo.weebly.com/uploads/1/3/5/3/135335207/8842761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_60c5235ea3280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144606774/torejepimumevofa.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/9.snf_kuran_kerim_ders_kitab_cevaplar_ata_yaynclk.pdfIn PDF document text
    • http://safubudesowi.pbworks.com/w/file/fetch/144940551/partlow_mrc_5000_manual_espaol.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/idle_breakout_hacked_unblocked_google_sites.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 5164 bytes
SHA-256: eb8e0cd4c5e63d84dce6c0636f435fd69022a1d4c6151d6ed81481093b8b57a7
font_01_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 10076 bytes
SHA-256: ac6cb1321137209f0ceffe21350d40d51f447d1cb67acc6dcb927f1cfc6941d3
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378