Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d36aafb33fce0…

MALICIOUS

PDF

93.5 KB Created: 2021-04-01 02:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a22e72f9738f4c5af1225dce0be0d2b9 SHA-1: c2e3f845b50417325d0c9081ecf77721670d8e29 SHA-256: a98d36aafb33fce02e003761ea69ae81abecf053cffc023918c9866a5c646af8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://kuzutuzo.ru/strik?utm_term=organic+chemistry+textbook+9th+edition PDF link annotation
    • http://watogoda.mypressonline.com/dudemudevirojikupadav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_604d3402cfee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_602b7bd0e9a3e.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/fibosit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_603a797dea72b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fe1c36b2684a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fce976cce941.pdfIn PDF document text
    • http://piregakatifeba.iblogger.org/4770928948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372073/normal_5ff2fc999e927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5fee3f336a325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_602e631358302.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/how_to_learn_silent_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5fd748d0afe75.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/ashland_oregon_map.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/vampire_predator_bible.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_600fbb2744230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_600a59f5c9791.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/torelosajipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_5fff6672cf7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_604d7000529fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_5ffd79ad0067b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofumakexoj.onlinewebshop.net/advantages_and_disadvantages_of_virtualization_in_cloud_computing.pdfIn PDF document text
    • http://kovudefimure.rf.gd/zegenuz.pdfIn PDF document text
    • http://gajopule.myartsonline.com/exercices_conjugaison_tre_et_avoir_au_pass_compos.pdfIn PDF document text
    • http://kobebosafuraw.rf.gd/jeep_cherokee_service_manual.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/66370769462.pdfIn PDF document text
    • http://fatifosavo.rf.gd/ratolebotinupadajog.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/applied_behavior_analysis_strategies.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_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 5876 bytes
SHA-256: 6079c179eecfe41fa878eaf7dc64d70c71dd45a3d4c4ec2ced79b4f99771a209
font_01_sfnt_off00014016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 11740 bytes
SHA-256: dde8dc6cdf745729ba2d2b256a2a31d00c5c71d45985ed58df0397eef985ef6d