Malicious PDF — malware analysis report

Static analysis result for SHA-256 151d27cc1fc73b72…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 23:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ef92f6bd7ca0b50c40940df67ceb96 SHA-1: 7f5f154615c80868d10dbe57b41bae40d065ddf2 SHA-256: 151d27cc1fc73b7228892a48971963ef0fffc4dae4dae45509f1f1ab1083acdd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are benign, but one critical link points to a suspicious domain ('ponafet.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=famous+quotes+of+zig+ziglar
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/4633762.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/bumolaripo_jibutejutubugeb_lexebekozonek_diwugajoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pidufozu/cincinnati_bearcats_football_uniforms_2018.pdf
    • https://s3.amazonaws.com/bibejovixapis/kalender_januari_2020.pdf
    • http://nuxumejaxumem.epizy.com/93455115751.pdf
    • https://uploads.strikinglycdn.com/files/0cfc7d8e-70f0-46ae-b413-b9219b145abb/university_of_hawaii_korean_natural_farming.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/jivopufidopatururixuto.pdf
    • https://s3.amazonaws.com/donukadizolin/gujemujidosodotudova.pdf
    • https://s3.amazonaws.com/zizene/comentario_biblico_mundo_hispano_apocalipsis_gratis.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/behavioural_activation_treatment_manual.pdf
    • https://s3.amazonaws.com/rovuweraja/calpers_pension_actuarial_valuation_reports.pdf
    • https://uploads.strikinglycdn.com/files/22c67f03-944f-498e-b415-4a1c5f7f9aca/what_is_worse_viral_or_bacterial_meningitis.pdf
    • https://s3.amazonaws.com/dejazuvorira/marine_archaeology_in_india.pdf
    • https://s3.amazonaws.com/womirofop/tepunefexoxekopado.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/siruvebezuwulebujibaz.pdf
    • https://uploads.strikinglycdn.com/files/f91045ff-37cd-4c32-86f8-7fc2df18310c/7919256044.pdf
    • https://uploads.strikinglycdn.com/files/f1417482-0520-47b0-809b-4f81830fb9be/28751094162.pdf
    • https://s3.amazonaws.com/zunaduxa/adele_hello_gogo_remix.pdf
    • https://uploads.strikinglycdn.com/files/a2c9536d-9a7f-40f6-85b4-79ce1acac1fd/how_to_calculate_the_acceleration_due_to_gravity_on_the_surface_of_the_moon.pdf
    • https://s3.amazonaws.com/wipotegadodorek/a._x._l_full_movie_in_english.pdf
    • http://vazavaxajude.rf.gd/the_central_park_five_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f217.bin
f1fbcc81516fc79d2711a56ad752eb4cbbb216cbc52f9bff0577b0b5553c2aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 4992 bytes
font_01_sfnt_off00010325.bin
cfbdae4bce169752141730ea455c767a3bf46fb3470f5a33ddd54e10fe3a30f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10444 bytes
font_02_sfnt_off000126c2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 4324 bytes

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