Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5f009145374351…

MALICIOUS

PDF

79.5 KB Created: 2021-03-17 16:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 06065ce990641b4252cd135267c5ab23 SHA-1: 2b1e2f24a4259cf1f3cad1b085d065d1b298aa22 SHA-256: 8e5f0091453743517f78cd52c651dfc4f9bbbfcdb3c420cdf399e29e9626f9e2
226 Risk Score

Malware Insights

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

The PDF contains numerous links to suspicious domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SUSPICIOUS_LINK_LURE' point to the document's primary function as a lure to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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://nipisod.ru/award?keyword=cfa+level+1+mock+exam+pdf+with+answers PDF link annotation
    • http://trysoda.club/94369971187tlgh6.pdfIn PDF document text
    • http://sell-toclick.online/architecture_campus_design8dhz3.pdfIn PDF document text
    • http://dvertsoff.ru/how_to_replace_a_thermostat_batteryjbcz4.pdfIn PDF document text
    • http://mmuuue.space/craftsman_10_inch_band_saw_user_manual3swx8.pdfIn PDF document text
    • http://future-techno.ru/sejalusenetugibtezo.pdfIn PDF document text
    • http://hookup756.fun/nys_insurance_fund_disability_benefits_payroll_reportrov9u.pdfIn PDF document text
    • http://fastgetme.online/20462422337b5nfu.pdfIn PDF document text
    • http://jakartapro.xyz/36687086389p48p1.pdfIn PDF document text
    • http://ig-supportcenter.xyz/40526952169i57ni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_2f4b46c1458845cf88b4b70b03e8bd2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dff6932-651a-498b-8b7c-a7f8562e230a/what_is_a_dilation_line_in_math.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_cadf5871b81447b085daa70b818a2b68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e1acf0-cc1b-4c8c-9e47-fb6b31539c57/acer_s230hl_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f733c38-d14c-47fe-9c07-37bd7b248c8d/80258451269.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_010e19e1c94540dd95fc7ac60f34e25d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/347ab98d-b328-4c6e-9386-1d276b76674d/xifudojop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6187db-3fb0-4a4c-bedc-5bd6b4d57bca/xifexasoxipixasumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0889ac39-293b-4cf4-9825-459ccb4de7b1/67433012005.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_c999dc28339e4de39b08d675617f7adb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62fccad-19cd-4f16-b5cf-c19be4dc0486/4017317603.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_c8c9471306fe411989c558a55b08fc87.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5636 bytes
SHA-256: e2f9ce2f24edfc1af75d1e5afe838b04aba21f791c0d0883dc0df8783d0dbecf
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 11516 bytes
SHA-256: 73240a8a0de5ff8237dbc7d49ab1e79ecedaec9f6c6af03224ed2fe0413e91cc

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