Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e757ce85f2f250…

MALICIOUS

PDF

92.6 KB Created: 2021-04-15 22:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aeac75f3ae5d2138867edbdd508b32c3 SHA-1: 517fcaaffcdfad60f66966d1199d10bab3a5719e SHA-256: 57e757ce85f2f250135fdacbbd9f8f0b69db67c0640e23e3f8436a5216f6f5eb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=mothers+day+children%2527s+message PDF link annotation
    • https://cdn.sqhk.co/rekosiseweno/6hbgehh/jereruroxaf.pdfIn PDF document text
    • http://xifasiv.getenjoyment.net/zubozof.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/8559911.pdfIn PDF document text
    • https://vabisoxapulaji.weebly.com/uploads/1/3/4/4/134444495/8409095.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/vosetiluletuk-fuxobu-sumewoxaj-mosewojunenima.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/sefosutulu.pdfIn PDF document text
    • https://dotofopig.weebly.com/uploads/1/3/4/3/134307416/6601303.pdfIn PDF document text
    • http://tuforuj.mypressonline.com/buddhism_in_japan.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/gegcob7/6662269084.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/dejikogowesaze.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/hetYtUC/the_information_subscription_discount.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/aac9518a6fbfa50.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/5th_dimension_consciousness.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/c0ec83a8.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/gixufat.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://foxufaba.weebly.com/uploads/1/3/1/4/131482874/8861aaa5a8089d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexupanuwobazab.rf.gd/design_and_analysis_of_algorithms_nptel.pdfIn PDF document text
    • http://jiwigazuvix.rf.gd/maggie_a_girl_of_the_streets_chapter_18_summary.pdfIn PDF document text
    • http://vemireme.epizy.com/meloganopulowuzi.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/functional_analysis_cbt.pdfIn PDF document text
    • http://monudoxufanexax.rf.gd/zirijolazefasuwudimebanej.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/30663448089.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_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 5492 bytes
SHA-256: a2ef1858ba1c35140ef6b51aeff51bfef74738805d8c31ea0ed92b9acf92cbd0
font_01_sfnt_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 11356 bytes
SHA-256: e4db01199c816b3c4774363f3ff98faf8b4923cb33f307fdae1245eed283d381