Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdbc18c301c87e9…

MALICIOUS

PDF

67.0 KB Created: 2021-01-18 07:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 36c012f5236bdc3d7fcf5e91177064dd SHA-1: 9962b212586502bf6aeb18325278077a831069c0 SHA-256: ecdbc18c301c87e95d181a86623b34bf1879a6ceeb92118e71ea262ae1fc6705
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to download or redirect to malicious content.

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://trafffi.ru/123?utm_term=yamaha+xvs1300+stryker+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5f9edd250bc22.pdfIn PDF document text
    • https://site-1171105.mozfiles.com/files/1171105/free_boxing_training_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/xivumatozo/jhgQjbY/mafamoxinobokuwokem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fa1ef420d1bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5feb18175ca53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f93ca8976c45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5ffbd2451c031.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/r4nMWja/sesofegukumasivowupit.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvomafoda/eHjihg3/opseu_strike_2020.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/8838884.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/cgeji7e/8934906314.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/LicLFia/battle_angel_alita_last_order_volume_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fd84fd9cdb6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f9c07071db05.pdfIn PDF document text
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/2140228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5f99c59008118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fd3cb0dc2acb.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/Zidnrib/zofezane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000be90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE90 5536 bytes
SHA-256: 803bb6cd0368c4f4034f62a589b4f578455a3a6b298527cbf36525438f5734ac
font_01_sfnt_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 13564 bytes
SHA-256: 40b0379f53be834d6a2c2b546ebf6439bcd128e57af5760f71622093a25cb0c3

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