Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3add5c000eea18…

MALICIOUS

PDF

75.8 KB Created: 2021-03-18 16:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ffd879b60fb387e1c30d478bc907b6 SHA-1: 7c26d87469d322f9dfd9305295445ba0c08100e2 SHA-256: 5e3add5c000eea18ac3b79bbd094afd88bf52da73ace492411803e5af9b377e8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a mass external link farm, with one primary URL pointing to a suspicious domain. While no scripts were explicitly extracted, the structure suggests it may leverage embedded JavaScript to facilitate the redirection to these external links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=quando+o+titulo+de+eleitor+pode+ser+cancelado
    • https://cdn.sqhk.co/fuwufupi/xyiiWih/28852417060.pdf
    • https://cdn.sqhk.co/nawamuzimosu/djbAhiF/vixurobiwegukipewak.pdf
    • https://cdn.sqhk.co/sesijisova/Pjdsgfq/lefewadovezaxovomanuzop.pdf
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5fd380c79ab7f.pdf
    • http://paselon.getenjoyment.net/kindergarten_math_addition_worksheets_free.pdf
    • https://cdn.sqhk.co/fejisedetu/jbnegfy/grow_kingdom_mod_apk_rexdl.pdf
    • https://static.s123-cdn-static.com/uploads/4375200/normal_5ff7e99874a39.pdf
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/5b3272b4b7f7.pdf
    • https://cdn.sqhk.co/fapebenu/8uv9geB/89378124726.pdf
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/0e0e22e7b80eac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jexawatenafule.rf.gd/ancc_med_surg_certification_practice_questions_free.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_901faa062a0d4281a89ad64281f8d54e.pdf?index=true
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_1078e9d25c7a41fa9ffc02215159d72c.pdf?index=true
    • http://sorisavitekinuj.onlinewebshop.net/explorations_in_the_ethnography_of_speaking.pdf
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_6190c4dc3a4f465bb276d3390ecfe20b.pdf?index=true
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_889214b9266446f4bfb2c338cf184fce.pdf?index=true
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_25a5515655b74d7193401388237b5224.pdf?index=true
    • http://kojexeruxub.epizy.com/open_box_return_policy_microcenter.pdf
    • http://welojorolepone.rf.gd/ribinowira.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61f.bin
666356ec6f278e9676d25480acc934cdc6bfe54b1a5759714b4a190fc15c5a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 5128 bytes
font_01_sfnt_off0000f798.bin
5a125bf47b836f686ebe7bcd97154ab83513b48e7e67f21969b7767931fafbc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 13492 bytes

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