Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc38f6df4c2bd166…

MALICIOUS

PDF

68.3 KB Created: 2020-11-25 20:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1a34f94aae832fc274b534d84e5d9a34 SHA-1: 62ceadf972ebbf1f9e16de5f0a7fe253c0e73287 SHA-256: fc38f6df4c2bd16667cb33d0d16c05d25704f9cf803f4573f34b67d5f5a99e77
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/strik?utm_term=reggie+gray+houston+intercontinental+chamber PDF link annotation
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/8736835.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/vitiregavoxofe-xaviferatavatax.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/guvafalinuvariz.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/4530252.pdfIn PDF document text
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/c96bb89499.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/5850192.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/be0fc1b7-f433-4d52-9a65-409283d5822c/fimabudukuxetegutobogiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c99564-28ad-440f-aafc-1457e373fa9a/programar_control_de_directv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59709f4e-0595-455a-9826-949175129e78/80084594967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5db001-7e86-4a8c-8204-8a4e96263b79/68828555876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5235a7b3-2296-4b43-b985-d597b9bc4cdb/vidmate_apk_file_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdc1eb7-c00c-4398-8dd3-d6dbbfc98291/lomejojomos.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/datepicker_angular_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4884154-6afc-4d48-84c7-2a623087b058/mid_chapter_checkpoint_answers_grade_5.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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 5464 bytes
SHA-256: e04e509e1c61c043c10c904ebc713f7ebbe3b165391adb0c0defb4b74fe87c9a
font_01_sfnt_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 10872 bytes
SHA-256: 3e80004da6d426afbeac590f0cfa909ff4718ce628ff6fa4a01e142d9df70b11

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