Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f86bbfed39794d7…

MALICIOUS

PDF

73.8 KB Created: 2021-02-23 21:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a27c2d324a9877e406fa614b10e48d87 SHA-1: e30fab2b2c003e563f200225a3d3358a7fbeb86e SHA-256: 3f86bbfed39794d774bbb1ce238bdb0912784b714f7ee907a76281f3302bb145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One prominent URL, https://maypoin.ru/strik?utm_term=garmin+astro+320+updates+software, indicates a lure related to software updates, likely to deceive users into downloading further malicious content or providing sensitive information.

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://maypoin.ru/strik?utm_term=garmin+astro+320+updates+software PDF link annotation
    • http://helpcontactform.com/petigawu9ult.pdfIn PDF document text
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/ee4968faddd79.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/putexolaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_601a3aae7fefa.pdfIn PDF document text
    • http://priz24.site/98073974659br6f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_602178fbf0c8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5feea2b26b044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_601d74cb3846f.pdfIn PDF document text
    • https://desujerobum.weebly.com/uploads/1/3/1/0/131070458/bakevawaxonofixe.pdfIn PDF document text
    • http://slamelina.website/yamaha_rx_497_schaltet_nicht_einep5xt.pdfIn PDF document text
    • http://zukilobuzoroko.66ghz.com/24733315285.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/jaloto/sezijovenijazefaga.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/12191895697.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/epithelial_and_connective_tissue_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/raranafepo.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/oxford_english_urdu_dictionary_apk.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5716 bytes
SHA-256: ee9ba208883068ac6d287ab287468cfb3ecfedae229e046d42250026bc88069f
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 10192 bytes
SHA-256: b4b869d46ac501ddd7dcf9dc8810d241571318288a530da269e2340ceaf16f9d

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