Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae99c11905b2032…

MALICIOUS

PDF

87.1 KB Created: 2021-03-20 20:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0f460b0050bff3a6cb59f6dda827d63a SHA-1: ecd94b9154297f4ee48f64aaddf39a850002e16e SHA-256: 8ae99c11905b2032622cdde6137b793b2c574f17ecbaac4d974558c01640c466
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically referencing 'Kindle fire hd 7 battery not charging', suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

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://resalured.ru/strik?utm_term=kindle+fire+hd+7+battery+not+charging PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376874/normal_604044c02ef04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468551/normal_602aedcf7b95f.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/oihgiif/13637661104.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/57664481549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_603c3f8e1b9c8.pdfIn PDF document text
    • http://pemojubeku.iblogger.org/tujivegekisepozapef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5fc6a6630f812.pdfIn PDF document text
    • https://cdn.sqhk.co/voromerubagu/ihgyhaD/sapuvitis.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/gIjjwgf/alpha_guns_1_hack_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jhifGhi/60543553514.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/jgehbji/fivovobovovaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vapelomusanu/xCoibpx/3689888492.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/25070138318.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/how_to_write_an_apa_reaction_paper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_6033f5eb08f43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/somotiluburugafagobinur.pdfIn PDF document text
    • http://buxamojajowolos.rf.gd/57027515891.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/47013498768.pdfIn PDF document text
    • http://zavipazo.epizy.com/16428244920.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/becoming_supernatural_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/best_online_drug_guide_for_nurses.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_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 5396 bytes
SHA-256: d20a0f771b483df27276327de2b66a540dcf74f3e2e488a1bee9091e0cbbb4a3
font_01_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 11092 bytes
SHA-256: aae4475730b37f50019759beba077a624d695d7141af58c028c89fef66feaca8

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