Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a2d7886049f29a…

MALICIOUS

PDF

70.8 KB Created: 2021-03-10 14:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a3dc1882f0af9f606c667c6c04d74bf SHA-1: eb66e30e1cb4622c7f89ec32d53ef12d99195e75 SHA-256: c3a2d7886049f29ab168b437d66a61a131c53f38820d50f897f2eee51c52a2e1
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one that appears to be a search result lure. The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=how+much+money+does+software+testers+make PDF link annotation
    • http://zopokujejisolan.getenjoyment.net/vocabulary_workshop_level_b_unit_5_synonyms_and_antonyms_answers.pdfIn PDF document text
    • http://firstdoctor.xyz/free_photo_editor_iphone_78ryqj.pdfIn PDF document text
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/aba27e3c1b.pdfIn PDF document text
    • http://allostar.buzz/30545305698jov9d.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/dfd9fc86.pdfIn PDF document text
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/f54c77ccdb.pdfIn PDF document text
    • http://ladijon.iblogger.org/casio_edifice_first_copy_price_in_pakistan.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/berghaus_down_jacket_size_guidezc5jo.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/78151616612.pdfIn PDF document text
    • http://meetcabinets.xyz/29298329717vdijp.pdfIn PDF document text
    • http://vipiditowazozu.22web.org/aditya_hridaya_stotra_in_gujarati_free_download.pdfIn PDF document text
    • http://xajoraxi.22web.org/diwovagoweti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/banugazonawaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8890708-fc47-48d0-bfc8-f49b233e730c/sezusawiwameriwezapijuno.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/bizikumawas.pdfIn PDF document text
    • http://nomamazuzut.atwebpages.com/zimepajotenuteremuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8a9482-6408-4e5f-b00b-32747e1177a3/79979252929.pdfIn PDF document text
    • http://puvuwanixos.rf.gd/6823347335.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/the_essential_rumi.pdfIn PDF document text
    • http://fewodekikagusag.rf.gd/xalezefelam.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/3296764410.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 5448 bytes
SHA-256: 162b955179e24e5837eae9cf16934eca483667c335c548318660cabdcd80829a
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 10196 bytes
SHA-256: 52ae1c77680207cfae9f2a8841adb24997d8a7b35380994fb8c3196fe6c4c561

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