Malicious PDF — malware analysis report

Static analysis result for SHA-256 751cafe582c0ada8…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 01:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7fba8a87e2260f1296361f1609f6647c SHA-1: b7762b4a4dc82b38ebdcc8438ca35987380d053f SHA-256: 751cafe582c0ada825e266c620bc517935397ae4cca38e2422172d9117f8d3c3
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and numerous external URLs indicate a potential for phishing or SEO manipulation, possibly leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=graco+nautilus+car+seat+fitting PDF link annotation
    • https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/damiv.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/77302829452.pdfIn PDF document text
    • http://gotosutafizal.iblogger.org/htc_one_m8_display_change.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/boxuputefuta.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/8893c.pdfIn PDF document text
    • https://vulazijol.weebly.com/uploads/1/3/4/6/134648863/parajeratur.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/3e8182e4795f7.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/jenoxitovuxe.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/f018a.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/online_attendance_management_system_documentation.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/c1644db.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/nepin.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/0c26bc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_accb255c6b8a4f0292e3900dedd6efbd.pdf?index=trueIn PDF document text
    • http://zijiwaras.onlinewebshop.net/bacteriocin_production.pdfIn PDF document text
    • http://zozupajekuledus.myartsonline.com/lic_jeevan_akshay_form_440.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_079f2e3fe4e14edeae7a1037af9645d9.pdf?index=trueIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_5d9c5b3d594142b3b3f124db28a756ef.pdf?index=trueIn PDF document text
    • http://tipokeviti.atwebpages.com/54500002115.pdfIn PDF document text
    • http://sufapanizesemot.epizy.com/39985119526.pdfIn PDF document text
    • http://fikexole.rf.gd/bombay_dyeing_bed_sheet_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 4964 bytes
SHA-256: 289f7a84409ff0f6b58712f61c5d55f8c3c555280a617b0eef72c24c0bc6c5e9
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10608 bytes
SHA-256: 1bc2a1e3440700de71ea5ee3a3c9ccf257dee4e4d05b1ac51d9c17c41a338a28
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f