Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12781f0c8babd72…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 13:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3b1b5db812a48e32589c5ca7d78c74ef SHA-1: 8f06dae25d44cfe27fe829fea4fa3e1af9ca704e SHA-256: a12781f0c8babd721e900b4f609d972adb9a80f5d11f2ea1d858ec33f43618a7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing malicious content, as evidenced by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/aws?utm_term=kenmore+top+load+washer+drain+filter PDF link annotation
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/wofamodigap-zimifoxixopum-mojigufebogi.pdfIn PDF document text
    • https://pebizenif.weebly.com/uploads/1/3/0/8/130874023/6585494.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/40650797493.pdfIn PDF document text
    • https://tofixotiz.weebly.com/uploads/1/3/4/6/134621190/mokowuxumenevopijinu.pdfIn PDF document text
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/vurujolomugepujomiti.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/naza_m_lite_upgrade_to_v2_firmware.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/2650e217.pdfIn PDF document text
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/5911404.pdfIn PDF document text
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/f2e1a7.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/9c0b39a04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_d1170d3f7d42438f8bb791c76ebf2f44.pdf?index=trueIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/47558959192.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_f7a9c9de268d4a55bfec60aa8ef1d97b.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_bcd93a356c20400985441c88163b9207.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_8c447fbe64e74e199b169d851e7a3f57.pdf?index=trueIn PDF document text
    • http://kuxexulotubi.epizy.com/barovolifabed.pdfIn PDF document text
    • http://vijanemafe.rf.gd/cpanel_free_for_ubuntu.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_f4ad6c3458264b649056e727d31d50af.pdf?index=trueIn PDF document text
    • http://jatokipukaku.epizy.com/force_table_experiment_lab_report.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5344 bytes
SHA-256: 6bdfc952d6abbaf65c8224c05ee5d0a9e6d88b6f22d21886dbc670c4e5771681
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10868 bytes
SHA-256: 58df626d06d1d16b1a93da4aa29a0f2e9ae05c58c1dde3dbcd9716cd172574ad

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