Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3d984b40a2a356…

MALICIOUS

PDF

99.6 KB Created: 2021-04-11 05:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8ea2172ac50f86c6d135c1f829027e80 SHA-1: 847df4a5b38df3f2acac855ebc1ee45241cc7c23 SHA-256: 6e3d984b40a2a356cddef2c9cf5a6940f7bf10a1035ef5f40a0279fd3ceb3d24
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or spam distribution tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL suggesting a phishing lure related to anniversary greetings. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+to+say+to+your+pastor+on+his+anniversary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466673/normal_5fd29d5de5d07.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/5709603.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/hghhT29/luteponexugudijikanu.pdfIn PDF document text
    • https://zigetavut.weebly.com/uploads/1/3/0/8/130814179/5c43f.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/WeihgfS/junior_project_manager_job_description_construction.pdfIn PDF document text
    • https://mogazikazalag.weebly.com/uploads/1/3/4/4/134440800/56849.pdfIn PDF document text
    • http://wosojedawujemi.iblogger.org/wevuxefez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5ffffca72e5de.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/d22ede0c6ca.pdfIn PDF document text
    • https://bebaguromiva.weebly.com/uploads/1/3/0/8/130813696/4b4b13c370.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/31806.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/1732682.pdfIn PDF document text
    • https://boziwigezuzes.weebly.com/uploads/1/3/5/9/135984517/wimopikovuvuv-pevulovorib.pdfIn PDF document text
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/dipupurezula_volavenas_naresugepa_tofedabuwakoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_602263b1b59c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wujamomototugo.epizy.com/63607930319.pdfIn PDF document text
    • http://fegizopanawu.epizy.com/fidazozovufolefofigagap.pdfIn PDF document text
    • http://zewomasajeguzud.epizy.com/barron_s_sat_practice_test.pdfIn PDF document text
    • http://bopikor.epizy.com/92929714286.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_off000145cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CF 5048 bytes
SHA-256: 60703984cda0f2e09d0f6e6e44f8bb660c42cd2212f02f54e928a463736494c1
font_01_sfnt_off0001570c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570C 12332 bytes
SHA-256: d0f4f63f28fb083fb62d18ad3105f1332ef595c89d342c65c2321c77292b5111

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