Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b62ec7cf10ff10…

MALICIOUS

PDF

70.0 KB Created: 2021-03-24 14:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef6ef35baf550c23d08da4e28f260fd SHA-1: 5472e87aea7038b866f039e992aaf513f12a13c5 SHA-256: f1b62ec7cf10ff107cbf31fe610315cbf23d75be8561ef17789495492ea42d37
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'conversion from const to non-scalar type requested' and the authoring application 'wkhtmltopdf', suggesting a lure. The embedded URL `https://seumenha.ru/wix?keyword=conversion+from+const+to+non-scalar+type+requested` is likely used to redirect the user to a malicious site for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://seumenha.ru/wix?keyword=conversion+from+const+to+non-scalar+type+requested
    • http://shoes-storie.club/44605020959tw341.pdf
    • https://cdn.sqhk.co/rivotoxupow/diiKidz/56621565240.pdf
    • https://cdn.sqhk.co/bomumuxa/jInjjbl/zuforejikidadakawoxu.pdf
    • https://cdn-cms.f-static.net/uploads/4477626/normal_60584c95769e3.pdf
    • https://cdn.sqhk.co/lisakopew/5Phgfhc/44800333624.pdf
    • https://cdn-cms.f-static.net/uploads/4480899/normal_602519b8e7af9.pdf
    • https://cdn-cms.f-static.net/uploads/4421937/normal_6051ae459d963.pdf
    • https://cdn.sqhk.co/soxuvezosapa/gdPYibJ/arrowood_golf_course_oceanside.pdf
    • http://thecet.xyz/movie_maker_free_programotgew.pdf
    • https://cdn-cms.f-static.net/uploads/4500904/normal_602ac06a738e8.pdf
    • https://cdn-cms.f-static.net/uploads/4426075/normal_60378f03c01fc.pdf
    • https://cdn.sqhk.co/tosilura/jhijhQK/ximetesedukogesi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af3ae5db-eb4b-460d-9e84-8a0310244fe2/99363306038.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/allotropes_of_tin.pdf
    • https://s3.amazonaws.com/salosibejodod/14981964673.pdf
    • https://s3.amazonaws.com/fidobakipivogit/fisezijapojiwerike.pdf
    • https://s3.amazonaws.com/tozaduliwubega/66382593458.pdf
    • https://s3.amazonaws.com/tisegovofu/supobakamekod.pdf
    • https://uploads.strikinglycdn.com/files/4d91d84c-43e6-4548-ba5d-6e9e2a6f70a5/72046219311.pdf
    • https://s3.amazonaws.com/zasepo/world_best_games_for_android_phone.pdf
    • https://uploads.strikinglycdn.com/files/043b6c91-a658-4679-8caf-737f0a313f8b/biohd-3_error_fix.pdf
    • https://s3.amazonaws.com/feliso/dizomivakumibumukubexab.pdf
    • https://s3.amazonaws.com/zikeko/52006646947.pdf
    • https://s3.amazonaws.com/wovugi/dimple_bts_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/f6e671b5-b8bb-43d0-b43e-97ec4eff26ad/my_passport_ultra_mac_to_windows.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_off0000d04e.bin
9d49460d2e57e5ef25e87bd211b29d7ff06d720b12d324f8d71ffb39a9136dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 5528 bytes
font_01_sfnt_off0000e316.bin
d4cd0815e28e1718a575b473563362b6efcf77d2a071a30a891b679d0d1d5bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 11468 bytes

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