Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4244ed065f0a49…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 01:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 09d4334733d2ca9e8a398728463468fb SHA-1: c9e65db42481e1472da12d08bf43dd19bbcd30be SHA-256: db4244ed065f0a49e6f52a641b87308ae9454579f772721b46bb32b48d66bea5
196 Risk Score

Malware Insights

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

This PDF document contains a mass external link farm, with multiple URLs pointing to SEO-optimized content and redirectors. The primary lure appears to be related to 'how do humans affect the everglades', directing users to suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/wix?keyword=how+do+humans+affect+the+everglades PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470839/normal_6019b9f987b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_603f02423d0c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5fd314023791f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikenazuvoke.epizy.com/what_does_the_end_of_the_magus_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/children_s_animal_picture_books.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/wuvuxumowivoruwedud.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_4a02e97331354a11bb9ac8e3415067eb.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_43cfd8883b304178bfb589ea77c72a2a.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_8b59bd5f1d8b45eebf57127ad17b9c8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/13299069034.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/bethune_college_admission_form.pdfIn PDF document text
    • http://fuxazulofonu.epizy.com/relative_pronouns_esl_worksheet.pdfIn PDF document text
    • http://jamoxesadesoxa.rf.gd/pejowidaravurunivegajejep.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/bangla_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/pusavujozabezotado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55efa809-918c-481f-b2fd-1af64a9a775b/hp_stream_11-ak0006na_11.6_inch_laptop_white.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_5e5e0398522f42e0917a25a1284bf331.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_27501cb0939b45c68f948d5e00a8cca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/terminator_dark_fate_official_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d326e8-7970-4055-8ac7-e75ad4bddfb6/canon_powershot_sx20_is_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/toparobimuzavatasos.pdfIn PDF document text
    • http://newubopuga.epizy.com/xumamigogomidetesuxexum.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_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 5548 bytes
SHA-256: 593514feb36cb230f6d480d8aeb16889c86da41d5d3124a9d2eb8ff56b546a86
font_01_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 11336 bytes
SHA-256: af39fff34a8f966fcd99e8ca502eaae401721c542f76248f1159dd4c09837533