Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2516851488043b4…

MALICIOUS

PDF

87.7 KB Created: 2021-03-28 00:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 18618918c14c48225cf6d12e58683ed1 SHA-1: fa3797928e632775d7498c2bc6ad3f84bcb2fa34 SHA-256: b2516851488043b46138f1e8d3f5a2ea4e176c2f3859da495c352f2327525c9d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be part of a lure to direct users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maypoin.ru/wix?keyword=thermospa+parts+manual PDF link annotation
    • https://pekavodasusoku.weebly.com/uploads/1/3/5/9/135982803/85b47a68e.pdfIn PDF document text
    • http://salimom.mygamesonline.org/causes_of_poverty_in_the_philippines.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/3b74a.pdfIn PDF document text
    • http://creditactive.info/avatar_hollywood_movie_hd_free5xr8d.pdfIn PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/satetan.pdfIn PDF document text
    • http://loveworld.club/fufokimaziwagosobbuauh.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/xisumesemififu.pdfIn PDF document text
    • http://vipadminler.org/aimpoint_pro_extended_battery_cap4r5yf.pdfIn PDF document text
    • http://save50.pro/pivuraxuzakapaxatuzemttmj.pdfIn PDF document text
    • https://tezogikezuvar.weebly.com/uploads/1/3/4/5/134584113/beziw-nirimoned-wusapi-kikixus.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/valumu.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/bozizuboz.pdfIn PDF document text
    • http://umdtheatre.ru/calling_bell_sounds_freetghab.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/wolowixibi-rowunonizabu-muwiziju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_da867c34ed224367bb359604326801e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/ruwabemavavesu.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_dcc2b456f5ab4d758da9bba85f22a9b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/namusetapitoruwewale.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_e9b2029998b74caa836471f427ad5e4d.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_c8e343e46f8f488b9af40e3576ec1e3c.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_c34aa969a3234ad199bce8537d3f287e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/283680073.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/xefudexujurevawofavovex.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/38848054133.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 5008 bytes
SHA-256: ece0233426cbf3c1fc278f6c705c333219d36c5e510d41e3e85b24cccaf52662
font_01_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 11524 bytes
SHA-256: 2ad8e864ef1b88cc0d20fb58b413663b688b6f1e0535c9f28e45a373ac863803
font_02_sfnt_off00013b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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