Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1b7081783773eb…

MALICIOUS

PDF

95.0 KB Created: 2021-05-14 01:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1cf24bff5e4260644e3c629875f5043e SHA-1: 7dd7de3c5f66f5965b336ab51fd0d30ed0616192 SHA-256: dd1b7081783773ebb1576c7ccb94ef7a81fd7666248bb9b3cb29c0398dbdd69f
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to disposable hosting sites. The primary heuristic firings indicate a PDF SEO link farm and a phishing trojan, suggesting the document's purpose is to redirect users to potentially malicious websites. While no scripts were extracted, the presence of many external URLs and the ML classifier's high confidence score point towards a malicious intent, likely for ad revenue generation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/strik?utm_term=how+to+calculate+molecular+weight+of+oil PDF link annotation
    • https://cdn.sqhk.co/divojimo/ajbGjgo/86922835775.pdfIn PDF document text
    • http://svoydvalend.xyz/wojoxubo4un4w.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/jboxgg6/cabify_logo_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5fc91da95787a.pdfIn PDF document text
    • http://inmyshtangen.xyz/verb_to_be_exercises_printableixh03.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/8gMkDhe/fobifabokajevinoze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496001/normal_5ff5d1accae37.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/jh9jg89/bandicam_watermark_png.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/hcOhaif/4044794529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_60515b2bcbeb8.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/iLhbThg/foxumibokila.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/afROdrX/donadexidikoxetorijo.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/7ehfbjH/walmart_moneygram_customer_service_phone_number.pdfIn PDF document text
    • http://badge-verification-center.com/946815923229bd8k.pdfIn PDF document text
    • http://detonic-buy.website/summoners_war_lost_centuria5omyh.pdfIn PDF document text
    • http://artyom.guru/nufusiv1mk00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vapekepufarifo.rf.gd/wimote.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_0e2c100960874fb69ac4bea1cc7b6e7f.pdf?index=trueIn PDF document text
    • http://guxodolabisiruj.epizy.com/bcbsnc_appeal_form.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_0e29ae24d18d418398cf0980055a1c15.pdf?index=trueIn PDF document text
    • http://zajimalivi.rf.gd/20239704943.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_30e3488e934d4aa7b7ce5b726d5a067c.pdf?index=trueIn PDF document text
    • http://dimizisunope.epizy.com/gifaxewukemeximevowavuv.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_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 5168 bytes
SHA-256: fcc974cbadb1c8b639fec4d54ed0f6d353effbf310704443711ba5e3658f832d
font_01_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 14368 bytes
SHA-256: ffae223b1ca0c5683a02453ce7849fba5c69bf51a419884fc66399ac0921ac42
font_02_sfnt_off00015916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15916 16060 bytes
SHA-256: b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c