Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d094bcb7f6654b…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 14:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc8babfb2b07c1528bd6c547bc9756a2 SHA-1: b088d6398045e7f1d284362bb7c22b9aae902168 SHA-256: a0d094bcb7f6654b08e6e5c3912bf00355e6c0bdecc80a66fbd020dc859851cd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'baby cartoon video tamil' and metadata indicating it was generated by wkhtmltopdf, which could be used to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/123?utm_term=baby+cartoon+video++tamil PDF link annotation
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/kazalugopegezobenode.pdfIn PDF document text
    • http://hackins.site/lectoescritura_para_nios_de_segundo_gradotb08s.pdfIn PDF document text
    • http://tosety.xyz/associao_de_capacitores_mistai77ww.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/bugenisa-fufugukade.pdfIn PDF document text
    • http://alkim.xyz/629968497355yygi.pdfIn PDF document text
    • https://tukadivi.weebly.com/uploads/1/3/2/6/132695248/f1fb2efa9c5d3f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_600274b62ea1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6041b64dc22a2.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/lujodurefigale_dirulukijipif.pdfIn PDF document text
    • http://fastpysystem.online/dageni4jjjj.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/kukovoralib-ribujuwisifo.pdfIn PDF document text
    • http://ylyn.ru/website_to_bukunmi_oluwashina_music7tf7s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_6043082ab33b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_604a7636cafcb.pdfIn PDF document text
    • http://erogan-encolumbia.site/21791269737iy2ts.pdfIn PDF document text
    • http://nasty666.space/10750085050uzqj7.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/vibasujefir/gujafujonolikateto.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_eb4a29c5c62241c6bdd98404db02e7b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/bavaxufizixejo.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/pirates_of_the_caribbean_r_rated.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_081a028a4b964f789eae5b1b2a684fe1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/24361678629.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_10ca74ea1bfa46ca825208b582fed107.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/4686968566.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_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 5256 bytes
SHA-256: c05fe608c4d47310e79d5170718e663001e475fb9ac22921e1c8653fcf64a25d
font_01_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 11344 bytes
SHA-256: 1de74322d11a98c5fdfca84a4e1c731b22566193e38e7c9770814df9d1d5ceb1