Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca3c5f0d0c28cdb…

MALICIOUS

PDF

68.7 KB Created: 2020-11-11 03:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8a8fceecd983a36ab9c92eb2da600d0b SHA-1: 78450df65782723b85b05989937d76d395108b68 SHA-256: 9ca3c5f0d0c28cdbc038c00960e523a510339f50c5345245ff4aaf8124a6defd
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL identified, 'https://gettraff.ru/aws?keyword=gyro+machine+propane', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?keyword=gyro+machine+propane In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f8c037c6a086.pdfIn PDF document text
    • https://xifamosavujefiv.weebly.com/uploads/1/3/4/4/134457952/delijamopafufis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_5fa0f93142b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8eb45f82c70.pdfIn PDF document text
    • https://ligenoleka.weebly.com/uploads/1/3/4/4/134496601/39310.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/e0e6aef5-9d8b-4d00-b4a3-4b02007d0ec1/59224989561.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/spirited_away_tree_spirits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1abe3a-1204-42d7-bc10-6659eb47ea7f/wujinikusuvebagimavoxujon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ed05f4-ec69-44bf-9e20-feab63cff14b/jilumomojedunizugoxare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156d0969-d860-4bed-8d25-8d9952258783/mitarema.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/baleno_accessories_price_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/gudunikixigaxemevanopop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f634bbc-e165-4202-8ee1-e46ff6216cb4/42640032246.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/89288099161.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_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 5096 bytes
SHA-256: 2456e65d792a506f3339b007f6a92611bb7be3c27cbd3302dae571f4a34a5de4
font_01_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 10392 bytes
SHA-256: 8f5999715da7e1e5248b91c424693eeac95b3266fbff3335093bde07182fb735

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