Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae049392314f5d8…

MALICIOUS

PDF

85.5 KB Created: 2021-02-15 14:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eefa633855ae20f99d9be89691a8cec2 SHA-1: 10d7f9d29c0d54f95ea94b5e9563ffa45ba2efa3 SHA-256: 0ae049392314f5d8a3a8e9af2dc04d9cc792ead323f134bd69e5d196326c0a83
186 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 hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to leverage web content for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=project+management+online+tutorial+free PDF link annotation
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/jevadugotemot.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/vuzanevubogamu_sujadakov_maxuxitotol_sogupem.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/ginawamam.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/jjjXwl7/animal_runner_in_the_world.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/icKjj4f/retrograde_motion_earth_science.pdfIn PDF document text
    • https://cdn.sqhk.co/vevigagexoxa/jcjclaj/14959606511.pdfIn PDF document text
    • http://fruitnaturs.space/13416351113hrioy.pdfIn PDF document text
    • http://fringigejy.site/kedurifedozowurelap2ugl4.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/aoNfijg/78729624337.pdfIn PDF document text
    • http://busforpay.online/992059542304a11t.pdfIn PDF document text
    • http://slimitalia.space/2710917263g5t8c.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/Uifwyij/idle_island_build_and_survive_apk_mod.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/timituvupame/audio_from_facebook.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_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 5100 bytes
SHA-256: 12786eecc875dc4189838cb3bc856b51cb23a12e9bc5d9fdfe0a7ff11eab7b8f
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 11148 bytes
SHA-256: 5d35f3e21b8d98e8073dc3c024641b72b145b3f4ad4f74ae20dc271436269512

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