Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f5ee8634b533c6…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 18:14:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: be0bfb049f2f7f019c68b13af974efa1 SHA-1: 86dd0cc558a8204486345b6cc5673b6cb285bc4c SHA-256: 64f5ee8634b533c6303fb6a5c6c39816cee21c8ddafef88a697e0193e6f7cc79
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 0.9998

Heuristics 7

  • 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.
  • 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://jacksth.ru/aws?utm_term=how+to+use+transfer+tape+with+printable+vinyl PDF link annotation
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/456d0493c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/i7nyuha/to_contemplate_or_think_about_something.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/239961.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/9712042.pdfIn PDF document text
    • https://cdn.sqhk.co/vuranataxu/fhjWsrH/6118890615.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/gjon0ic/wovemaxapezekefazifuju.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/sinadi/newukesovilidal.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_b675c7ca0c2844e6a0ffa17a5aa931bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f90a21f-256b-4383-982a-6ea128a7c4da/silugat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6302b45f-1d2c-447c-9e08-8fb1b5a40a74/77091103019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090f4807-5297-48f2-afd0-ce098e4a6001/what_is_classical_economic_thought.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/67598366939.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/esl_worksheets_elementary.pdfIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_08eb0681e80947ddac5ac854a274b8f1.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_9877e9388187427aa3230087010dc6e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3171af8-eaed-4b4a-8d23-860595b067cc/18637510223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247f33a3-6d7f-4175-b6fe-e895b7f4a884/the_book_of_job_deals_with_questions_related_to_suffering.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_5dc2c73c8296461a92bde555465e40f4.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_1f07e263e0444c51871b59c166217660.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/riginudiwolezediw.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_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 5344 bytes
SHA-256: 1648ec7b7aca932f3a4ecc9838e55794d2c9797cf40fe4111516da8a3b316501
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 10968 bytes
SHA-256: 84138212cc3412d656a36047d1f5c1ccc3ec68e7c90cddc5aac4976fd4eb94f1