Malicious PDF — malware analysis report

Static analysis result for SHA-256 3310cf2e20a328b9…

MALICIOUS

PDF

98.2 KB Created: 2021-03-16 10:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 086d0d1fa8cbf788343be51a762d01b6 SHA-1: 4619065175b4b46ff3b8403ee22b3212f17c3071 SHA-256: 3310cf2e20a328b92eb1a02129ee1695561ba406ef7cba277deff8d10061002f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://resalured.ru/strik?utm_term=price+of+generac+whole+house+generator', suggests a lure related to generator prices. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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
  • 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://resalured.ru/strik?utm_term=price+of+generac+whole+house+generator PDF link annotation
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/457624.pdfIn PDF document text
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/sunesapesubo.pdfIn PDF document text
    • http://pukatasenibi.iblogger.org/the_witcher_3_walkthrough_ps4.pdfIn PDF document text
    • https://terurudib.weebly.com/uploads/1/3/4/3/134381327/3862487.pdfIn PDF document text
    • https://vixewomofuv.weebly.com/uploads/1/3/4/6/134606761/teguweje-sixededowoj-tamoxire.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/vunisaninakenugowuwus.pdfIn PDF document text
    • https://bejuzozomixur.weebly.com/uploads/1/3/5/9/135966319/barunobozakan-jupur-mitefuremuj.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/beperavet.pdfIn PDF document text
    • http://guvizaw.22web.org/xexuxejogubawo.pdfIn PDF document text
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/1bdfaab11c6.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/dubiditiginowo/7809390147.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/22051538901.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/dismissal_letter_template_gross_misconduct.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/93379101394.pdfIn PDF document text
    • http://fumojaj.epizy.com/63719949188.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/24624182857.pdfIn PDF document text
    • http://sopazanit.rf.gd/35095296976.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_off00013faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 5236 bytes
SHA-256: 28f5c8944370f7603a6bbff17f35096caa92e80a66ff43bd453f28a2aacb3fcb
font_01_sfnt_off00015190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15190 12568 bytes
SHA-256: 72b78b4e2c640e13249b8132b6058ebfe19c7909e10b0f47156dc92003413b07

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