Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a76ff2cc3845a5…

MALICIOUS

PDF

73.4 KB Created: 2021-02-19 17:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 00d454347e837022c67f54de01143cb7 SHA-1: 49fe36616f70ad558507f00da8b2ad1f44883f6e SHA-256: 08a76ff2cc3845a53c597fd5a2cc435835493cf7386be5d6013c3877d09884da
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The primary embedded URL, 'https://jacksth.ru/123?utm_term=how+do+i+stop+my+plantronics+headset+from+echoing', suggests a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=how+do+i+stop+my+plantronics+headset+from+echoing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386095/normal_601644c408421.pdfIn PDF document text
    • http://liketime.online/60950996894foxcn.pdfIn PDF document text
    • http://fagemolorano.iblogger.org/by_dnc_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ifgijDO/91486083092.pdfIn PDF document text
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/9129281.pdfIn PDF document text
    • http://daravto18.ru/helix_jump_ball_gamesf0lmb.pdfIn PDF document text
    • http://poradoit1.site/ufc_fight_tonight_free_onlinedx5v3.pdfIn PDF document text
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/11e4bcf.pdfIn PDF document text
    • http://in-step.shop/diaper_genie_refill_hack6ytsx.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/d6c0e47a89c.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/37aae.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/6e51d34.pdfIn PDF document text
    • http://megazoni.iblogger.org/52867455349.pdfIn PDF document text
    • http://copyrighthelpptteam.com/maniac_b_pill_explanationto9fg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naremijex.epizy.com/mubeboneno.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/adjust_flashlight_brightness_android.pdfIn PDF document text
    • http://zekubegem.epizy.com/begotu.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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 5724 bytes
SHA-256: 8b0864beb9557e4a3b38f9daad8c38f0c22b672ae8fd992524daae94b7796c02
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10912 bytes
SHA-256: 4c01851c45a0075628c433b21f0e6010dae82d2f7e0d44f2cac6e22ad2445d50

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