Malicious PDF — malware analysis report

Static analysis result for SHA-256 708a3ef83d74d65a…

MALICIOUS

PDF

86.3 KB Created: 2021-02-25 21:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8bf6b85023dbfc2505d00e54acaf8608 SHA-1: 92de9829ddfe04b6a63e4b22d60621236681a585 SHA-256: 708a3ef83d74d65a22c628b7357a06e6a04e16aa313bd4d6340af4987b2923a0
186 Risk Score

Malware Insights

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

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 0.9997

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://druttle.ru/123?utm_term=baby+jogger+city+mini+gt2+double+car+seat+adapter PDF link annotation
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/2976909b5a17ee.pdfIn PDF document text
    • https://jugevenow.weebly.com/uploads/1/3/4/7/134736768/e3762d25.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/a685bab7ac6.pdfIn PDF document text
    • https://kuvenamowafave.weebly.com/uploads/1/3/1/3/131379608/4950f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_601d5c2bb7514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fdab0f1b360a.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/9095936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422136/normal_5ffcd6b7c7e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/hMVjjje/switch_pro_controller_light_around_home_button.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/legenapi/tuxoluvak.pdfIn PDF document text
    • http://koraxirimaxodet.epizy.com/campaign_gift_pyramid_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/how_did_gigi_from_jerseylicious_lose_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/supervisor_comments_on_performance_evaluations.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_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 5892 bytes
SHA-256: b6f4608795b57c6662e5ba40e34c7db38015ce9347c85aa01df5135f6ca08c79
font_01_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 12972 bytes
SHA-256: 453105b2e70c67970c39b8610f06803d6ad8fe15210a836f856f085e14fabbc2