Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3a51e6ea7f84d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-03 04:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bfb2d0c866d8d8e05f11107044dda9ae SHA-1: 3c8b21f53aef534df745820dfdaa02ce35bbd07e SHA-256: a3a3a51e6ea7f84d3e41b695f7b73981231dd5c04d262666b7df5a18f40df367
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 0.9998

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://druttle.ru/123?utm_term=sunflower+seed+oil+chemical+formula PDF link annotation
    • https://cdn.sqhk.co/rubutemoxe/2jgihjf/nesagujudamigamunabewi.pdfIn PDF document text
    • http://complerbnp.com/60217679041yllu5.pdfIn PDF document text
    • http://werisafijorarit.iblogger.org/how_to_program_my_spectrum_remote_to_vizio_tv.pdfIn PDF document text
    • http://munupozazuwo.iblogger.org/h_pylori_treatment_guidelines.pdfIn PDF document text
    • http://jinomikezed.iblogger.org/ravel.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/dOhi6ia/funadegijivunodizif.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/dzRjpRa/light_up_vanity_mirror_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/jfbaLnA/74116723093.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/hIJjfhh/79193806137.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/ibD1bgi/bukapizasewogetid.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/5k3ibgi/64136738024.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/cpjaenI/ice_cream_blackpink_dance_practice_mirrored.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/aQhgidc/free_baby_stuff_samples_by_mail.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/lSFjeyN/56609695398.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/BieXJ9u/bedoyecta_shot_ingredients.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvitaros.epizy.com/dream_dictionary_sick_baby_boy.pdfIn PDF document text
    • http://lelexuxifu.epizy.com/ssc_stenographer_online_form_2018_last_date.pdfIn PDF document text
    • http://vedezanopade.epizy.com/how_to_write_a_motivational_speech_for_employees.pdfIn PDF document text
    • http://dutuzapeka.rf.gd/activex_control_vs_form_control.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 5456 bytes
SHA-256: abe0524b3d1e8b0be3152f55ab93c2fbf27024c71a47d38fa0ad4857477e0e77
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 11332 bytes
SHA-256: 04e7024f1c968f9c702d1fcc1ee04ea46c095039881b7315d4a944ee3b65c45e

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