Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fd491305cb53ed…

MALICIOUS

PDF

85.3 KB Created: 2021-04-03 07:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ea989c3ed64d5738d0ffda1a850c8539 SHA-1: 1b32f1726676e60b3b21cef7e6e93a54e4d8d601 SHA-256: 00fd491305cb53edb2f2cce877dcc525d752cc8f26b5e240016253b77b57e430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dafemum.ru/award?keyword=analogy+reasoning+tricks+pdf PDF link annotation
    • https://cdn.sqhk.co/veletafi/iCibhdg/41124612471.pdfIn PDF document text
    • http://rivalo130.com/fumazivibegesuklwxz3.pdfIn PDF document text
    • http://ouily.xyz/the_fall_movie51sm3.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/87211972325.pdfIn PDF document text
    • http://wigomufeze.22web.org/kiborapijaruzewuk.pdfIn PDF document text
    • http://noverst.xyz/ruluxeliowis.pdfIn PDF document text
    • http://rkconstructionsucks.com/nobajukafumildzqjv.pdfIn PDF document text
    • http://discout.online/96000311328essyj.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/UjhAkk1/18074439562.pdfIn PDF document text
    • http://setlyb.online/9850028466pkxrd.pdfIn PDF document text
    • http://zazerure.22web.org/gekulajijaxemofuvunofa.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/northwind_database_access_2020_tutorial.pdfIn PDF document text
    • http://help-mediasupport.com/4514339124764xdg.pdfIn PDF document text
    • http://good-production17.site/xidowebofikwjwn4.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/geOEugg/65664688654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojobawezelo.rf.gd/bogale.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/como_aprender_ingles_online_gratis.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/vatizujejesifimevime.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/ielts_reading_test_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/cancha_de_baloncesto_con_sus_medidas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 5476 bytes
SHA-256: f872a45e3afdbdd35fc23b25ffe9dd73426887f4436d46765fac894bd08df79d
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 11064 bytes
SHA-256: 2bea85d6a5838209b64b5517b088b0e0b8e84d74e23348196fbfebfe10630b02
font_02_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 16100 bytes
SHA-256: fdddb335ff8dece42f228d947c1e82464c0b4537f5387ada480d9c348f5f5637

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