Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a43d676172795a…

MALICIOUS

PDF

75.6 KB Created: 2021-04-03 14:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f7749beafdea2f9861c30c861f2dac94 SHA-1: 0a9437432d049b90a3c9c70c5b8ee2f5f90f1293 SHA-256: d4a43d676172795a23e80ae92e823a31bfd81c6e497391710535d9351ec8e877
186 Risk Score

Malware Insights

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

This PDF document contains a mass external link farm, with 30 distinct links to other PDFs hosted on various domains, including disposable ones. The primary lure appears to be a psychological analysis of Kafka's 'The Metamorphosis', which redirects to a URL containing 'aws' and the same search term. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/aws?utm_term=la+metamorfosis+franz+kafka+analisis+psicologico PDF link annotation
    • https://ritiburup.weebly.com/uploads/1/3/0/8/130814353/kifidazaregadimarupu.pdfIn PDF document text
    • https://ruzojewa.weebly.com/uploads/1/3/4/4/134437104/1ffc61cb729.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/6a85b40da23fad.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/ieFnrJh/gigod.pdfIn PDF document text
    • https://busegozujukot.weebly.com/uploads/1/3/0/8/130874370/petuvu-piwikixo-jolibidim-godawinomiduz.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/rosakeguwe.pdfIn PDF document text
    • https://xulijuba.weebly.com/uploads/1/3/1/1/131164032/506709.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/1igjhij/658296342.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/kufusok_retaboxos.pdfIn PDF document text
    • https://jexisaguratoka.weebly.com/uploads/1/3/1/4/131409442/muwikibanu_zifuruvozev_tejano.pdfIn PDF document text
    • https://cdn.sqhk.co/merutigujet/jfhdyih/inverse_variation_worksheets_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_e662fa86f7a54e6f82aac563a44a3c57.pdf?index=trueIn PDF document text
    • http://lalexipitu.rf.gd/diy_playhouse_plans.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_9a9496de289e4766b8da2fc6ef9a4ef3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/fidorudoputi.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/nipivi.pdfIn PDF document text
    • http://sipisadam.rf.gd/rowenta_portable_steamer_reviews.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 5388 bytes
SHA-256: 1122ce7463e4f3ad13b98dd8a98851989d083f2e8b73d66dcc27caa6d0f0a3fc
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 11072 bytes
SHA-256: 46744945292780f68f40f31040d669f6f16ed1be2a1459c3af153fe70d2bb07b

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