Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db703bbbb2d9100…

MALICIOUS

PDF

76.7 KB Created: 2021-03-05 11:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e4d10223445f83a51718e3dec8d3864 SHA-1: 1bb203ae5517d9f38a48fd6b18a95ec4e45947f4 SHA-256: 7db703bbbb2d9100e5846e96bcc91ae12a9a721b57b6c3f014814da0f7698f2d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document, likely used as a lure or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=what+are+the+5+basic+prayers PDF link annotation
    • http://rinuzaje.iblogger.org/jelowevikuselukazotubovi.pdfIn PDF document text
    • https://pegalidaxib.weebly.com/uploads/1/3/4/6/134632492/dexunosozalogo.pdfIn PDF document text
    • https://morarinaxi.weebly.com/uploads/1/3/4/5/134528003/tokuzodolexuvuxewoj.pdfIn PDF document text
    • http://wifokilite.iblogger.org/85198860674.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/tibowafedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likasiz.epizy.com/siradul.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_21c80eecbe5a4fb0a78b731e9f86c494.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_756ec5a3aac24b8c8b6c478e3d2e6ec9.pdf?index=trueIn PDF document text
    • http://bopexetosezulav.rf.gd/79164664923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e78e6db-9c79-4fa8-83b1-bdb58b08a795/xarumeredaravemikama.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_1eab99a24eba423eaa01d3f745f9e875.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff19aeb-cb68-4217-b9ec-11e73d3d79fc/tegavavu.pdfIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_3ceab45dbd5943118525cf260787e46c.pdf?index=trueIn PDF document text
    • http://jefevuxivux.epizy.com/tojod.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_00260208274f465d8e115107de247c3e.pdf?index=trueIn PDF document text
    • http://widafasamuj.epizy.com/manual_treadmill_reviews_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66ca3c1-8c0f-4c15-b2b0-9a8bae4169b1/95392239918.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_eb4a4e0f9b2c495d9d38dff8beb851d6.pdf?index=trueIn PDF document text
    • http://nonakiwobituk.rf.gd/diborebuliwadunuvoxufafam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5593ca-2be2-4319-980f-dd3cc1e913dc/fakutirimaridezepibirudiv.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_60352b617f1548778f46776b47051f3a.pdf?index=trueIn 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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 5368 bytes
SHA-256: 073f9eb44638f1fe7b352bd5c2d807b04230ebfe787a1f4a0e507332d10128ff
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 11168 bytes
SHA-256: 2492316bf576e98c4bd8870833fc75213304d8079ec5440a23852fa8a8e76c0a