Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd6dbe182ea1e7e…

MALICIOUS

PDF

83.4 KB Created: 2021-02-01 15:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cd89b48b04f7a551202e7a6d88c7f75 SHA-1: 34b90da9d13531e4c09f84c8da995c9bea8a4753 SHA-256: 8fd6dbe182ea1e7e8c307b76565dfa75e4b931a64c148da483d54af049ec8d0b
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including invisible ones, pointing to suspicious and known malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SUSPICIOUS_LINK_LURE strongly indicate a phishing or redirection attempt. The ML classifier and ClamAV detection further support the malicious nature of this document, likely intended to lead users to malware or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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/123?utm_term=dead+and+bloated+god+of+war+ign
    • https://cdn-cms.f-static.net/uploads/4403806/normal_6010ab4af2664.pdf
    • http://securityofusersdevicesonline.site/free_family_feud_templateck4o5.pdf
    • http://service-hire.com/cowboy_good_morning_imagesuybwx.pdf
    • https://cdn-cms.f-static.net/uploads/4446401/normal_5fd1c466380ff.pdf
    • http://hdvideo.design/single_phase_controlled_rectifier_with_resistive_loadxhsbh.pdf
    • http://sizegivip.22web.org/xusimifo.pdf
    • https://ludajajuxo.weebly.com/uploads/1/3/5/2/135293479/rolovikiviwen.pdf
    • http://freefire-gifts.com/97716665439zjz4v.pdf
    • http://helpcopyright-service.com/exceeding_the_core_worksheet_answerszfc72.pdf
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/4277762.pdf
    • http://alcexpress1.xyz/grand_pixel_royale_battleground_mobile_battle_3d_apkpureahlpt.pdf
    • http://muvibigi.22web.org/80724158878.pdf
    • https://pemifapizu.weebly.com/uploads/1/3/0/7/130776061/mafefedidulujurakemi.pdf
    • http://lnstagram-helping-centre.com/motorbike_sidecar_racingbra4j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xezeruv.epizy.com/8457280172.pdf
    • http://jeduvuvojupan.rf.gd/40179589973.pdf
    • http://bigagapafobari.rf.gd/togafutomen.pdf
    • http://gotuziput.epizy.com/bavivedap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ad.bin
59a2bd5406b4c0ceab8bb69d1116a2a405cc4d7578f0df4241753817dd462a8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 4916 bytes
font_01_sfnt_off0001098c.bin
f32adf46a83be12c75f5008e0c070c8c9930301c1b894b07d49ae11accc73c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 12084 bytes
font_02_sfnt_off000131ef.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 4324 bytes

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