Malicious PDF — malware analysis report

Static analysis result for SHA-256 5992304ccf87ecc6…

MALICIOUS

PDF

74.4 KB Created: 2021-03-15 04:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3517b88a6c59c0f99a822408ba279cf6 SHA-1: d2f29a6d05b2ac955d5539d2846ab4791a2c6d79 SHA-256: 5992304ccf87ecc6e0b23aab2f72d2b9dac64fe78f5f3237440374c91dd3f6d1
206 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to exploit users through deceptive content, potentially leading to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://resalured.ru/wix?keyword=minnesota+public+property+records PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5fec5dbfd1570.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/gjhahiG/30744548335.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/kibesiruwonazufikugibabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5ff669b4df3ea.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/30141198110.pdfIn PDF document text
    • http://tujidal.mypressonline.com/how_to_change_hoover_windtunnel_belt.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/ojjbiCn/penguin_pete_cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/ibig5if/39310327681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_601707fe1b05e.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/dell_latitude_e6540_i5_new_price_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/54Lhdhf/96402961485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_1b616ac12ae84d3a80e1a65e3881d5ae.pdf?index=trueIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_fd7eb2a16a674831b17a0288afa052fc.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_8953ff5ce8e844d7a493cca962321adc.pdf?index=trueIn PDF document text
    • http://kixazogegome.epizy.com/casio_fx_95_es_plus_manual.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_bc8c95b464c843f4a3ab787a8393234a.pdf?index=trueIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_c8f9019fe47749f1a0a3871ae371d5b3.pdf?index=trueIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/trasplante_de_medula_osea_2020.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_c91c85dbac4c46b59c28ed809a53cfcd.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_2a7dda99b7a943c199c23a9510da1343.pdf?index=trueIn PDF document text
    • http://luxizetugo.epizy.com/67766587533.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_b5932d487f3746d7b2fba82452a93aa1.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_3cd052839bc34699b3e6bb9a89d42ae6.pdf?index=trueIn 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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 5312 bytes
SHA-256: 3b05b67c8b0b6a81b34fec04b419090420adcde59a9b0fca07f411648ec84f9c
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10644 bytes
SHA-256: a08e1e7742fda569512e6926b2589d07d1484d6fc40190c7688525e7670b3bf9