Malicious PDF — malware analysis report

Static analysis result for SHA-256 af16c622d546c0cb…

MALICIOUS

PDF

73.7 KB Created: 2021-02-25 08:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 91812dbc089c8c5dbf1545eadc319879 SHA-1: 980edfce06235cf967da5294d77f24e6a464e34e SHA-256: af16c622d546c0cb7e0e60c250d59f3edbf3be0639770e823a8d807efacd231e
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, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

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://jottigo.ru/123?utm_term=cooks+essential+pressure+cooker+sealing+ring PDF link annotation
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/38fab24.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/xozalibarasubalur.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/7718723.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/nHijie5/snapping_turtle_eating.pdfIn PDF document text
    • https://wusaworapivuwor.weebly.com/uploads/1/3/4/6/134659128/zenirek_perip_xamalekefutite.pdfIn PDF document text
    • https://giweberemep.weebly.com/uploads/1/3/2/6/132682555/duditemigireru.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/8827977.pdfIn PDF document text
    • https://kajugolake.weebly.com/uploads/1/3/0/9/130969904/2854920.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/db06ee0.pdfIn PDF document text
    • https://juvumumirogo.weebly.com/uploads/1/3/5/3/135313675/cd9f52409e5125.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/kubedukowug/xatonarufuzekoxaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/bharat_movie_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/51105891979.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/36113387880.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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 5068 bytes
SHA-256: 265fbb6750383e1d4bbe5fb9c32b39460193dcb5400c9af70b67d6f975099736
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10892 bytes
SHA-256: bafe7b5c830adbb1d94cb4d473ba7e223e53709566d92c50716ba665524e400d

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