Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef62c9c353a3180…

MALICIOUS

PDF

80.1 KB Created: 2021-03-18 10:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3aca6bbb54ed7014d6766728e8436515 SHA-1: 5649594d40bf1b9eacf169ec3ee586c85a9ac690 SHA-256: 0ef62c9c353a3180cb638b505087fe6899df706808f198ebb3522e41f61d956a
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/award?keyword=jee+mains+b.+arch+paper+pdf PDF link annotation
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/ec131a47ab655.pdfIn PDF document text
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/7654634.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405641/normal_5fed331c5c648.pdfIn PDF document text
    • https://lumosezuto.weebly.com/uploads/1/3/4/4/134499790/lelibema_bizunowoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465270/normal_5fe43a90b03f9.pdfIn PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/5718244.pdfIn PDF document text
    • https://fuselenedirila.weebly.com/uploads/1/3/4/5/134597682/rukefijipotapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_603f28b501a61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_aed7efa8a9404a01afea070a51ea84fc.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_df226b911e27406ab47182958cd59bfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ecfdac-3e16-4a4d-9892-ae4a050783eb/sedakixavoriraxol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf78b425-adc4-4336-99ce-08ee5ede068d/sonic_mini_blast_size.pdfIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_d7e99268cdae4411a57fd0b4d4e43f20.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_a143ec3a2c734ae5a956a57ae29f0af6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/303d7578-6666-486d-830c-dd413fab458e/83870401486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12098dca-3ebf-4728-9553-30142bf14c49/59871589255.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/68830843973.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_7e3e03027d0e4346a265894b76093665.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fd4ea2-1153-4bea-8662-4845577edbf9/what_is_a_behaviour_support_plan_in_childcare.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/51687955735.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/losegoze.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_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 5524 bytes
SHA-256: 413b9606bc6a059c597597a64f68f3cc5bd0755744dcf4c256c75720d7fdfbec
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 10888 bytes
SHA-256: 68caa7c12c696434a415ac88b242a3a1a1405bb8faeaab8f50033902cd10ef7c