Malicious PDF — malware analysis report

Static analysis result for SHA-256 454ff098b1e2eef5…

MALICIOUS

PDF

70.0 KB Created: 2021-06-10 08:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ad46d21b97508b2a21776f83ee2c99 SHA-1: e0a25f9a3b12a56761450a2be55eab7de3d86bb6 SHA-256: 454ff098b1e2eef50a85509cf62ee6a26a9c028870f7fc862784d5c565636ab7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution attempt.

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://crysiq.ru/pbw?utm_term=meditation+guided+to+sleep
    • https://cdn-cms.f-static.net/uploads/4390661/normal_60189fa9c4cae.pdf
    • https://cdn-cms.f-static.net/uploads/4391903/normal_6015c560d785b.pdf
    • https://cdn-cms.f-static.net/uploads/4486061/normal_6015b4ebb107b.pdf
    • https://sojiguverapigiw.weebly.com/uploads/1/3/4/0/134017811/porizunudije-roligasisevefur-pazewigotomew-ditefe.pdf
    • https://tikemedatimi.weebly.com/uploads/1/3/0/7/130776462/zopafuweg.pdf
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/53f8473a.pdf
    • https://dumasibomis.weebly.com/uploads/1/3/4/6/134642495/mikiwujafub.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_60161695f14cb.pdf
    • https://cdn-cms.f-static.net/uploads/4405895/normal_60283f9ead0f1.pdf
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/f7ddb32.pdf
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/luxomisoxeked-tafetidakodu-mezovodoburopit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jaxonewu.pbworks.com/f/how_do_i_adjust_chat_volume_on_ps4_gold_headset.pdf
    • http://mefijunov.pbworks.com/w/file/fetch/144420597/how_to_become_an_electrical_electronics_engineer.pdf
    • http://nebapelamive.pbworks.com/f/can_students_get_a_free_bus_pass.pdf
    • https://uploads.strikinglycdn.com/files/b2227727-2970-460c-8454-1f5c7cbbdc26/addressing_barriers_to_learning_a_south_african_perspective.pdf
    • http://zepupifob.pbworks.com/f/validoviwapapirakekol.pdf
    • http://maxasol.pbworks.com/f/how_to_take_photo_from_video_iphone_11.pdf
    • https://uploads.strikinglycdn.com/files/92c64ea0-f705-4c93-93d7-bece1db3c003/64303247716.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_off0000d578.bin
fd9d1894769559f777980cb9da7c5748026ae9c3e0a5acbd33003f9b549fce1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 5036 bytes
font_01_sfnt_off0000e6bc.bin
3fe0fda1a51b36f0fc7772f31c0f6552bfab4db9233298431636ad463c5d395c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 10728 bytes

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