Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f732898cc163bab…

MALICIOUS

PDF

80.6 KB Created: 2021-02-06 16:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 08836fb7c1670a158496baaea740812a SHA-1: 906c9707639434a1369c062a416874695b1f11ad SHA-256: 6f732898cc163babc689c6602313288ae28c01c1d0d48152c0f5a45e13b96419
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

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://baarspo.ru/123?utm_term=autocad+3d+tutorial+pdf+2016 PDF link annotation
    • http://com-signto6.xyz/420720042342ygum.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/zetezofisoxuna_biduf_tivex.pdfIn PDF document text
    • https://rasaputale.weebly.com/uploads/1/3/5/3/135323831/9388765.pdfIn PDF document text
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/vidofoluvigi.pdfIn PDF document text
    • http://xowozumevabig.66ghz.com/zirige.pdfIn PDF document text
    • http://reduslim-official.website/make_pasta_food_kitchen_feverhzvbl.pdfIn PDF document text
    • https://cdn.sqhk.co/vonixilavot/hdigidI/58144066516.pdfIn PDF document text
    • http://vuxokiwi.22web.org/online_attendance_system_project_in_android.pdfIn PDF document text
    • http://pululap.22web.org/golunetigawemu.pdfIn PDF document text
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/kufemopusaka_famopufod_sutibem_kewutiwaxawa.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/9023528.pdfIn PDF document text
    • https://kigovedinefetup.weebly.com/uploads/1/3/1/3/131384362/turewazuw_petajufa.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/gumimisijaxufobosaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dorediludopa.epizy.com/xejawelixetulojav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 5604 bytes
SHA-256: ed453bfead6bfcbaa52f17bc6fe69eb07ddf593f317fe8d539f761003d8e785a
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 11084 bytes
SHA-256: 5348d30794b87f395f72ab807d78a3beea2f67ffa4805d9dfb93356dc3287f61
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 16168 bytes
SHA-256: 8c1e3298cb301b6aa2c2aeff0a89e1cafee6626e56d5ffa98ad52a7598c40df9

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