Malicious PDF — malware analysis report

Static analysis result for SHA-256 50952cd16541ebca…

MALICIOUS

PDF

78.2 KB Created: 2021-05-03 17:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e7eb5472fdcec26a30aa8ce4eacc69f3 SHA-1: 5309ce27c89649139ff607fd95cec0c19c1ec438 SHA-256: 50952cd16541ebca47f9fbc7f436454f58da09fd4746103fa49e20bcb9d9a8b0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/strik?utm_term=krups+ice+cream+maker+recipe PDF link annotation
    • https://mujonuwamuvix.weebly.com/uploads/1/3/1/3/131383921/lezekubavulux_pizexir_sameliwazaze_mapin.pdfIn PDF document text
    • https://molujeridinu.weebly.com/uploads/1/3/4/4/134400438/bafatoxojikovil.pdfIn PDF document text
    • https://dinozijumuf.weebly.com/uploads/1/3/4/3/134315767/978559.pdfIn PDF document text
    • https://wemadaxofopu.weebly.com/uploads/1/3/4/7/134752229/7253031.pdfIn PDF document text
    • https://lujututuvaribo.weebly.com/uploads/1/3/4/3/134339905/setunivupobujeroju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479446/normal_5ffad0a8aa102.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/wajikege-povamekuxe-bifuwozeru-tuwepifupap.pdfIn PDF document text
    • https://rivadosogub.weebly.com/uploads/1/3/4/8/134880553/pepajikatol_dizulekebefat_vogulokojoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_5fd64ebcd080e.pdfIn PDF document text
    • http://busumewum.22web.org/jogejiwinululupagab.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/nanirid-xakakif-voser.pdfIn PDF document text
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/juxogu-xikem-wifusereju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_60019ba5b7260.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/lopadivupudexa/6347900779.pdfIn PDF document text
    • http://gamalebivufije.rf.gd/66468526946.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/cuanto_es_1_pulgada_y_media_en_centimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/15269446886.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_0642c98fba7641ca895e2a936e683242.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/ccs_university_exam_form_for_bba.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_5824d100e5c545fbae75145eb7ee84ae.pdf?index=trueIn 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_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 5080 bytes
SHA-256: 519a825bc96296a7be2cb0bee8c5eb7ba799812d2d366b2983db9f0d154334b1
font_01_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10988 bytes
SHA-256: 9f9232075191705065022c5b31d4bd7c6cddc0bac1e93e6e5a305ce8f4d89168

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