Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19b271d52c283e4…

MALICIOUS

PDF

78.6 KB Created: 2021-03-13 21:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bbccab39761c686975dca55ed98189c7 SHA-1: e737687c55cc2f1c191d17342eb3fbc956fa01a6 SHA-256: b19b271d52c283e4fa9d55a77afc3fb3d37e69983e9fccfa04871793181469ef
186 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 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://resalured.ru/wix?keyword=nba+live+mobile+hack+generator+no+verification PDF link annotation
    • http://xukosususif.medianewsonline.com/chicken_biryani_recipe_bengali.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/60f7d.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/ropotasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5ffde1b66c837.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/12260697497.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/vurafubukata.pdfIn PDF document text
    • https://nikupotipemami.weebly.com/uploads/1/3/0/9/130969226/fubufosigo.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/67064468102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_601a62bb337a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_60467513017b1.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/6671993.pdfIn PDF document text
    • http://sixuvuwafow.22web.org/nukem.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/gezetega/cpa_canada_salary_guide_2019.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_c8e9f2c01bb94392ab232e60ed702946.pdf?index=trueIn PDF document text
    • http://pukupufiribeja.epizy.com/donuramitavujemozekedureg.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/wupakutapirijilezaj.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_a1503d6fca024474a22cb17d948d5f3e.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_d62cd2e942914075879a02de234b976d.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e51810c54ec849ceb3ed92ce9fddd304.pdf?index=trueIn PDF document text
    • http://lafagelupuf.myartsonline.com/annabel_lee_analysis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 5348 bytes
SHA-256: 34a2742f08d36ca51bab39bf3f6b6ad8ba1c7f49f43746bcb44cc8f82744f597
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 10884 bytes
SHA-256: 2077a1d05bd634e3feb3de355fe68e15b73c51811d24b5c3d36cdb02aac94d09

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