Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f4e256af19dff0…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 06:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f22c5418a27262dd333b725ef386e0a0 SHA-1: 11041b1d4aeab6b7e145ac7753377e98839db21c SHA-256: 81f4e256af19dff04ba56ee5d323a9c8c4ddb8822287545b1be05bef348807c9
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zurobalunaxul.weebly.com/uploads/1/3/2/7/132712088/323e530fe7d9da.pdf.
  • 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://dafemum.ru/wix?keyword=2005+ford+super+duty+fender+flares PDF link annotation
    • http://extrameets.fun/32140815859f2r0c.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/25125749532.pdfIn PDF document text
    • http://biomanix.best/raluxisisizutoburesaf8r4d7.pdfIn PDF document text
    • https://zurobalunaxul.weebly.com/uploads/1/3/2/7/132712088/323e530fe7d9da.pdfIn PDF document text
    • https://wivamugetatiwaw.weebly.com/uploads/1/3/1/1/131164202/9545329.pdfIn PDF document text
    • https://kasapumaf.weebly.com/uploads/1/3/1/3/131397987/a76863df3520a6.pdfIn PDF document text
    • https://navesurupuseg.weebly.com/uploads/1/3/3/9/133997449/c65df8bd.pdfIn PDF document text
    • https://mosofekux.weebly.com/uploads/1/3/1/4/131437457/061f3efe248d5eb.pdfIn PDF document text
    • https://takixonit.weebly.com/uploads/1/3/4/8/134899966/sedatagalazaji-ragijiwarexa.pdfIn PDF document text
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/7fda6933.pdfIn PDF document text
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/3386488.pdfIn PDF document text
    • http://mstmail.space/avg_crack_20199pg0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_31578de00c9b4003a37c416409085687.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/17541409834.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/newololunavisu.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/ad_cvd_aluminum_extrusion_compliance_worksheet.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/scag_wildcat_parts_list.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/schneider_electric_rccb_catalogue.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_5ad40fb40de24e09afad30f2364b0353.pdf?index=trueIn PDF document text
    • http://rulamiji.onlinewebshop.net/senujaredokuwinijimisoke.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/what_percent_of_human_trafficking_victims_are_female.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/42181490346.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_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 5440 bytes
SHA-256: 9613e26a5ad354787d9d7c8ab90d230baa182b90800ded95ea9a8e6a436a2257
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 10712 bytes
SHA-256: 2aafcf2e74e09a6e3d3f2fd7349280d24462a60f950dcdede9e205d3c8ba933b