Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5fa5d85c58a260…

MALICIOUS

PDF

82.8 KB Created: 2021-05-13 12:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4b586aa9a9873e971050c032483d118e SHA-1: d197343f590e68fb9304d2a50d4021f98c39ebde SHA-256: 1e5fa5d85c58a260eec0996c04a0bd61a00f9f355be60e0dc01eecda6dbd6cdc
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. It contains numerous external links, likely designed to redirect users to malicious sites for phishing or malware distribution. The presence of embedded JavaScript, though not fully analyzed here, suggests potential for further malicious actions.

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://leonvi.ru/strik?utm_term=la+polaridad+jerarquia+de+los+valores+segun+max+scheler PDF link annotation
    • http://50offshop.pro/zasuvezatedokafof6sx0.pdfIn PDF document text
    • http://belplitka.ru/fiche_identit_poisson_maternelledzfha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_6033573fbfdc2.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/8759822.pdfIn PDF document text
    • http://cabinetsop.xyz/16726878899et66s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375339/normal_5fcecbe820d2b.pdfIn PDF document text
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/f11857252.pdfIn PDF document text
    • https://divozurov.weebly.com/uploads/1/3/1/4/131437474/82bf151d1aa9b47.pdfIn PDF document text
    • http://bupro.asia/936603818575n07y.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/f46d0b329e51952.pdfIn PDF document text
    • http://idealsit.fun/de_cero_a_uno_libro_completould51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5ff5f109ccbc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da36ce1-5493-4d15-8c12-3284f45d507b/essentials_of_statistics_for_business_and_economics_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7737f57-e262-41ab-a544-f62edb6c4ab9/junipedunegarasupotave.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/7073217113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8af7c13-f63f-4674-a2bc-4b9e8514b43d/84463141020.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/introduction_to_adverbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/blue_jackets_roster_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6bdc67-92a4-46fb-9071-3b652046a2e4/what_is_the_anode_rod_in_a_hot_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372d39d2-5b14-44d2-8be3-589518862a88/kapigesorisedu.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/a_que_se_debe_el_dolor_de_oido_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/kaxunuga.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/how_much_does_it_cost_to_repair_washing_machine_bearings.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_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 5760 bytes
SHA-256: 68b12b0807a491ffc20b8227d8001390e62a03322e91f7c27e7a95f5461ef667
font_01_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 12336 bytes
SHA-256: e422d209f3111261a51fcfabbbd4b8a7cf13feef3a3df1996a95c3c33e9c4cfd