Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffca65a77d9ed6c0…

MALICIOUS

PDF

76.5 KB Created: 2021-05-13 22:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ec462b86a72d9ad8b3d408f6ea559b91 SHA-1: 0f41f155d632419dcd8ca7c1c9f59418df311987 SHA-256: ffca65a77d9ed6c01f8570d0d6ea43bbe21c9c1fb5355d3180db7d5709ce43f9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with a primary one pointing to `https://pelibifir.ru/strik?utm_term=singer+sewing+machine+stylist+834`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed to host many links on disposable domains, a common tactic for phishing and malware distribution. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=singer+sewing+machine+stylist+834 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5fea27b5c7412.pdfIn PDF document text
    • http://tricitysikhs.com/xufumuvegebavomu677dr.pdfIn PDF document text
    • http://gamedv.design/alexs_office_safe_codey0mwa.pdfIn PDF document text
    • http://luzesawajipux.iblogger.org/73254647127.pdfIn PDF document text
    • http://jitudowifite.iblogger.org/20146158864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_603349b4b90d4.pdfIn PDF document text
    • http://fezelaradelemuj.22web.org/internet_and_social_media_addiction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_601402355ab75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_605d99108246f.pdfIn PDF document text
    • http://dajazadek.22web.org/84029774027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_12b370d3e0e84a7691e9205838c2e3c7.pdf?index=trueIn PDF document text
    • http://vuxikujare.epizy.com/gugawisoji.pdfIn PDF document text
    • http://redikubegoda.epizy.com/gafasilalopef.pdfIn PDF document text
    • http://wadekazu.epizy.com/gaxorovekizudaxajeges.pdfIn PDF document text
    • http://wekujugom.epizy.com/android_phone_factory_reset_code.pdfIn PDF document text
    • http://fuwasal.rf.gd/53591921864.pdfIn PDF document text
    • http://muvotezazalad.epizy.com/wenilapofanuzaxadire.pdfIn PDF document text
    • http://lifanijuw.epizy.com/we_grow_accustomed_to_the_dark.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_6d72996e00a14a55aa9458e672b32923.pdf?index=trueIn PDF document text
    • http://dukodisedibuji.epizy.com/33298124546.pdfIn PDF document text
    • http://mapoler.epizy.com/body_systems_diagram_worksheet.pdfIn PDF document text
    • http://rinexabe.rf.gd/crazy_frog_piano.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_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 5956 bytes
SHA-256: e6bc547b152fe5f90ac952cbc0a9b974fab6362c91ca7f83e7f074d9511c9c28
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 10616 bytes
SHA-256: cb3e83b9ed98540ba944f3afd6d23d7bcc29f59a94322bbc6ea9ccd4ad6609b5

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