Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a493c76100fcbd…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 17:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a4ccce3318dd58e7c7261cede67b8054 SHA-1: 3002c1518b2a398a7e97f81f7b155fc950d216e7 SHA-256: 78a493c76100fcbd7114e0d05341666c46c200419bb7bd2f9b01ad880ade9d5d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, with a primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=easy+piano+sheet+music+for+happy+birthday PDF link annotation
    • https://jumolixebeze.weebly.com/uploads/1/3/4/3/134352805/bd8936.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/bjjejS7/wuvupetesuparu.pdfIn PDF document text
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/mofosebigiva_tedagogezuga_suwejuziluforur.pdfIn PDF document text
    • https://siwurarililoto.weebly.com/uploads/1/3/1/4/131453181/xifonisoxunose.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/hhiuv2y/download_game_metal_soldiers_2_mod_apk_revdl.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/wubumipajesat.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/hIPhfhb/word_of_the_day_bible_ucb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_601731e856008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_5fda773e1c2a4.pdfIn PDF document text
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/7064213.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/jigoku-foxixatitiduf-tafamozumol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_60310331bb28e.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/bufopavaxepasavidiz.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/fojonidojudagu.pdfIn PDF document text
    • https://solatozelejas.weebly.com/uploads/1/3/4/7/134714892/3521890.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_874c482d9d214c208b1b576939a3eba7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/bahubali_movie_in_tamil_hd_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/jomop.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/certificate_template_ms_word_2010.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_5feb6cff7bd849b584ab6cf9cb37ee4d.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_271c3a08eb72433b95589fc6eaa5ba53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/dobaxosakoxotap.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_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 5560 bytes
SHA-256: 67e618cbc4b880cb48d196c0d713a59664b3f97f7d51ef3179ebff86e5f3398f
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 10896 bytes
SHA-256: 4ec2eb03943433fad42fc1a78838de8bb70a5bc28ecfc806bec00a74adebc404