Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf6563566245419…

MALICIOUS

PDF

67.5 KB Created: 2021-02-16 20:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 00bd69b57e905c77fae1c4c31155bcdd SHA-1: e196e25fa561a9c59d562e71c30e6511ecabff29 SHA-256: bcf6563566245419977c4d196f7d3462b3be8e526a12e14f1a721f4074671cf2
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially malicious content, indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The document body, though heavily obfuscated, appears to be a lure related to a Netgear modem router, aligning with phishing or scam tactics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=netgear+n600+modem+router+model+c3700 In PDF document text
    • http://parkji5x.xyz/just_mercy_download9hkry.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/vikulolotodege-zuzatupij-diwolaxutu-jubowadubojesit.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/2363353.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/a30b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/hejfE6l/86275820540.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/wodujuzitexuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/gju7hbL/wuzewal.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/zpjj439/2147888407.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/jigcher/calla_lily_genshin_impact.pdfIn PDF document text
    • http://fastdonwload.space/vsphere_client_6._5_for_windows_7yftwn.pdfIn PDF document text
    • http://retys.fun/acrodermatite_enteropaticatl515.pdfIn PDF document text
    • http://verification-help.com/7103313385302yer.pdfIn PDF document text
    • http://dnepr24.info/senujupubimajovabapabort77w.pdfIn PDF document text
    • http://jilet1.club/zalebokudujilericufb.pdfIn PDF document text
    • http://edalovert.xyz/484822415645143g.pdfIn PDF document text
    • http://centerverifybadge.com/tiktok_logo_light_pink0emdu.pdfIn PDF document text
    • http://frut-tree.site/42177880338bbwye.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 5588 bytes
SHA-256: 959c33fc22c2229709215dac969d73577f542cfb50e6afc30595e6614458a2af
font_01_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10764 bytes
SHA-256: c3c7e83ad274154020e300524a39f7b50d38d0fbed3ff7afb75fe310b59cbef2

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