Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54ba95e81d3cfb1…

MALICIOUS

PDF

69.2 KB Created: 2021-04-07 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0d29638ed608d4179eff898eb8f3589 SHA-1: 096e54a2efe8fc764862edc1792f63b6eafd6f4b SHA-256: e54ba95e81d3cfb11f35d0f57ac8eed92ca3876805f5107e56489a1b372f9c7a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a URL that appears to be a lure for English comprehension worksheets. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting further support this conclusion.

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://gimoguvi.ru/123?utm_term=english+comprehension+worksheets+for+class+7
    • https://cdn.sqhk.co/xumesapaxoku/igNkXqO/amazon._com_store_card_services_phone_number.pdf
    • http://fuxezaboxekave.scienceontheweb.net/52581759154.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://cdn.sqhk.co/neratimo/jDsOv4h/seroruwuxe.pdf
    • http://azorocheat1.xyz/47546079834hk8ve.pdf
    • https://cdn.sqhk.co/vugomupuzisa/jgjjfSO/titatixinaxirakutilizuv.pdf
    • https://cdn.sqhk.co/finulepaf/KDiaUid/spotify_untuk_pc_windows_10.pdf
    • http://fulokixowo.scienceontheweb.net/poputekukureg.pdf
    • http://cybety.xyz/raku_glaze_recipes_freemcey1.pdf
    • http://tortomsk.ru/anet_a8_firmware_auto_level2sht1.pdf
    • https://cdn.sqhk.co/tenotitur/hbcQ7jf/screen_timeout_ipad_mini_2.pdf
    • http://instup.xyz/practically_speaking_j_dan_rothwellg5rlp.pdf
    • http://jetinaxisodew.mypressonline.com/catholic_liturgical_music.pdf
    • http://helplnstagramcontact6088757.com/how_to_deal_with_student_misbehaviour_in_the_classroom66u6s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gotafoveguna.rf.gd/naomi_klein_shock_doctrine_audiobook.pdf
    • http://tulufuparogig.epizy.com/tafor.pdf
    • http://lutubipejor.rf.gd/fulotelirabigujokok.pdf
    • http://zatojigetafugud.epizy.com/35788420614.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_off0000d069.bin
4990edd7217a1018ca06805dbd0036d1df6a1512aa92eab0d3967aeab7166ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 5620 bytes
font_01_sfnt_off0000e381.bin
20bf96e75a618d9c6d6c1ced6ac0de19a5c0c3a3f25963458153b52dcb733902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 11044 bytes

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