Malicious PDF — malware analysis report

Static analysis result for SHA-256 53103d5bf6b73ffc…

MALICIOUS

PDF

100.0 KB Created: 2021-03-06 22:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ea73619038076ace05b0163419608406 SHA-1: 2a4a19c0d5a611af4a5e7dd39767af2def0c7262 SHA-256: 53103d5bf6b73ffcbedf32dbeedce1d8963a82c931170e4c28f0428f69049d24
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'Proceso de investigacion de las ciencias sociales' (Process of investigation of social sciences), aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=proceso+de+investigacion+de+las+ciencias+sociales PDF link annotation
    • http://b0xberry.online/965579543489dihd.pdfIn PDF document text
    • http://digtalcaliper09.xyz/monster_problems_2020_film_online_subtitratbeqri.pdfIn PDF document text
    • http://tekplafond.xyz/how_to_set_up_a_charter_remote_controlsnt5g.pdfIn PDF document text
    • http://straponartist.com/37204174138ri5q2.pdfIn PDF document text
    • http://koteyarn.moscow/hex_commander_fantasy_heroes_mod_apk_atualizadoxfer5.pdfIn PDF document text
    • http://paktum.pro/rapebifupiwotosogibuwudaviavb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/darenetomimexebev.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_850e92a785194c499ed8147f74396d5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/158cad33-70ac-4309-8d0d-7bc7e394f068/13665974500.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_c6fc7d09066f409897140b84ff0aa8e2.pdf?index=trueIn PDF document text
    • http://tixinova.rf.gd/polyphonic_synthesizer_vst.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_5369b8eee58c43b8812b5e1ef688e8f5.pdf?index=trueIn PDF document text
    • http://kisidop.rf.gd/wemazutikotaja.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/puwunexiniw.pdfIn PDF document text
    • http://belepegaxotimi.rf.gd/free_online_environmental_health_and_safety_training.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_24f147a805c34a528fa549eb08f1c18c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/sundarakanda_telugu_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7172e566-26cb-47d5-9f33-f01122def765/what_is_fervent_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/nevekonux.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/setabi.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_043c4abb3677410ca64363dc674c6291.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0640cc35-043c-4688-8b4d-f64c9a060328/waverly_school_eastchester_ny_calendar.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016513.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16513 17844 bytes
SHA-256: c2b3222cdf4dcc280972c346b155f62e036e7958c36d585bb936b7ee3f347d7a
font_00_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 5168 bytes
SHA-256: 2f457963acf7c9aa2af1d7776173a4e59a6e0a5a88c2a3186bf0dd099c44ac0b
font_01_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 12048 bytes
SHA-256: b2409a21a701e71c1759b8c436460f0a0fb74b7fa7ca869e851d2620f2d57a90