Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f65c3bc8b7f2762…

MALICIOUS

PDF

78.0 KB Created: 2021-02-15 20:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56d6822689df060671730e8a7c50e1b0 SHA-1: 736084e11d217995720f56899e2ef302da6212bc SHA-256: 6f65c3bc8b7f2762a610941a78c339b430c18cdf345f547d2029064d29b76d64
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external resources, suggesting a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://yafferge.ru/strik'. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to be a lure related to preschool activity plans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+write+an+activity+plan+for+preschoolers In PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/5342970.pdfIn PDF document text
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/napiniwev_suzasi_kudofadobitabo.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/besenamuraxir_wijusoso_depalo.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/4213077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_601d07f602b87.pdfIn PDF document text
    • http://copyrightnotices-form.com/26823918827whrp7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_600bad3753696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60290d74c1cdc.pdfIn PDF document text
    • http://eurofamily.pro/fso_harmonic_scannernwc9x.pdfIn PDF document text
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/seriri.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/6980765.pdfIn PDF document text
    • http://ibkreactiva2020.com/tamilrockers_tamil_dubbed_movies_20140uctp.pdfIn PDF document text
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/8664456.pdfIn PDF document text
    • http://italiahot.space/inpixio_photo_clip_7._02ut23.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/relid_napowajugo_zoredobiwis_dusodofuser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_600a91173f552.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/kovilowab/limiting_reagent_practice_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/25863695118.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/55679507434.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/catalytic_reforming_of_heptane_to_methylbenzene.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/chambal_film_songs.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_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 5316 bytes
SHA-256: a6a41e592edc8460b0875ba8e59dac8c0effa2601699de7764edf6245930d38b
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 10520 bytes
SHA-256: 53917a7383ab09cab56a0eaf1f0b3082c69ed127cc1de28f294352e52f137880

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