Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5f9ac0ee1631d8…

MALICIOUS

PDF

71.0 KB Created: 2021-02-22 07:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3e2c59bdcdfde5363bc01682376a73 SHA-1: 3b92e1355bb7458de9ff9db54bd83611667cce41 SHA-256: 0b5f9ac0ee1631d8a4404e167cb831e07bf4c19bd2608261c2adb706f0fb528a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to facilitate SEO spam or phishing campaigns. The embedded URLs point to various domains, including 'jacksth.ru' and 'cdn.sqhk.co', which are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=what+is+data+science+work
    • https://cdn.sqhk.co/jesotipo/cjahihd/35172446856.pdf
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/734840.pdf
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/4695898.pdf
    • https://cdn.sqhk.co/pifonode/idOFUkZ/walexidu.pdf
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/ratakibiroranaw.pdf
    • https://cdn.sqhk.co/daxerarugak/iLwcrhc/powigeremimonopubuvi.pdf
    • http://discout.online/what_do_fraction_strips_look_likebgdo2.pdf
    • https://cdn.sqhk.co/gadewekunel/tJWfXhb/motexufokepekonuwirug.pdf
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/rakepu-memarozovibo.pdf
    • http://funomixukipiv.iblogger.org/dobenibepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://werowelunan.epizy.com/rajorevavep.pdf
    • http://sudimomovaw.epizy.com/48986009407.pdf
    • http://rixupod.rf.gd/check_register_template_for_numbers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d684.bin
42a136cd13e46c38b813d0a6d28f54ac370caeb85cf9f20b8390769c10230483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 5164 bytes
font_01_sfnt_off0000e824.bin
72e71ff0f9544827d44217bddf0b0f76a863a02f733e6a23d28cd6e49c240e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 12076 bytes

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