Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0920eb9af7f050…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 18:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aeb92ffe113a67d0271f1f566bb46f00 SHA-1: 47e254bca0ba28b2a301dc2ae57a3ff768a2acb3 SHA-256: 9c0920eb9af7f050af96b8020d89d3b413f81862f842ca5909107539f0ee5bf9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/aws?utm_term=frases+del+libro+el+arte+de+la+guerra+sun+tzu PDF link annotation
    • http://wivuperafuzo.mypressonline.com/kupeminaxapopanedud.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/patimid_retifezan.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/oogway_ascends_piano_sheet_music.pdfIn PDF document text
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/pegolor.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/deficiencia_de_vitamina_a_en_animales.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/xiramametuwofuzawosewaso.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/5d064430-d2d7-4cc0-bd24-d08b25f837a5/the_crown_cast.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/acta_de_nacimiento_tamaulipas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9c4da8-b2c9-4b0a-a073-4955caabd013/the_last_song_free_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce4102c-1ca2-41d1-8c63-f02167dd7f2b/magna_carta_effects_today.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/26171961429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc477ea-66dc-4f4d-bffd-0b676d769d32/xufubuvujimox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c438c1b-fe20-4701-b4d8-7db3240b81af/79422327180.pdfIn PDF document text
    • http://vurofanosikuga.atwebpages.com/rekukidikemok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ada581-633b-4a38-b8d5-dbcdded13e56/48388056590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d02fc9-6725-4727-9633-b811965828b8/92200092024.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/what_does_being_pregnant_in_a_dream_mean_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9628c2e1-d454-4395-8c37-047cef061882/sonerolinewanu.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_ae8a0b0d240444c1ba7214a2cf113651.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_e9463950a07b4eaf8b019559950589f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1574359-dd8b-42f1-904e-44123dc23f81/zafirafavozusebimuzo.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_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 5140 bytes
SHA-256: 3dbb3886fae01f02e49c12dbba97a8aa45a69217118e9af154c065845e886ba0
font_01_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 11280 bytes
SHA-256: 4479da92f367ddaeb67100697d89aaac09a8ac780cb9c403b64ca4b634622794