Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15c5db1f57c11bf…

MALICIOUS

PDF

92.5 KB Created: 2021-05-22 14:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ef3a74414eed5129bb65fdf613c45727 SHA-1: 21308a97b3f380c7f90e42ef708ed8ba24fe2040 SHA-256: b15c5db1f57c11bf4884054c55f8bda2515b7d216bce143b7fd4c775329a4db0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to artificially boost search engine rankings or to distribute malicious content. One of the primary URLs, 'https://lozipotod.ru/strik?utm_term=ejercicios+tipos+de+oraciones+compuestas+pdf', is flagged as unknown reputation and is likely the intended destination for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://lozipotod.ru/strik?utm_term=ejercicios+tipos+de+oraciones+compuestas+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478669/normal_5ff1614db7c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_604a8bde7efde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483088/normal_5ffc8ff0d63eb.pdfIn PDF document text
    • https://lixepugoguzezum.weebly.com/uploads/1/3/4/1/134132265/3954b9.pdfIn PDF document text
    • https://jejuzuvavat.weebly.com/uploads/1/3/5/3/135384919/3edd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_604cd10df190b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_606e8d4430035.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/6f1e2ff7-58b6-4910-81e7-31cd87e4bc31/new_headway_elementary_student_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/28280254157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee29dd70-2526-42f3-9f17-b02227a0fc66/adventist_youth_honors_answer_book_nature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee208fe-1fa0-4d9b-8a7b-e3d103f1a66b/86902336164.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/logitech_z-2300_computer_speaker_replacement_control_pod_wired_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/93025355155.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/befunky_photo_editor_pro_apk_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/16958850416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013549ea-f623-45a3-bda7-ef2ed89adcf2/lavik.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_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 5300 bytes
SHA-256: ad6213b9e67d1b464ad445065218cfba30bdabe81a4f8e39e52cff570a7c1f65
font_01_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 12612 bytes
SHA-256: 23a5dbff5f6129912ae2c9966d4bddcacdf0ae4c399be19ba6902d8df0fc7597

Open this report in the interactive analyzer, or submit your own file for analysis.