Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3b9c2285b79204…

MALICIOUS

PDF

73.9 KB Created: 2021-03-28 19:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d02be13e604fd6a51945e93302d63bd0 SHA-1: 57fa4146ef892c53121df4d85e79195369cd355a SHA-256: 9e3b9c2285b792040965627ba20f765705fb34fd62dad6448fe18c50447151bc
136 Risk Score

Malware Insights

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

The PDF contains a heuristically flagged random URL link, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of external URIs and the overall detection profile point to a spearphishing attachment attack pattern, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://golowaki.ru/wix?keyword=panel+data+model+selection
    • http://kanshoper.site/64729784398etwno.pdf
    • http://reactivaperu-viabcpi.com/vimavexibilapyie1.pdf
    • http://gradstroy.su/92989613651v5c14.pdf
    • http://privateguardingserviceagainstdanger.site/gre_test_at_home_costkstzs.pdf
    • http://reretola.iblogger.org/simple_past_regular_verbs_affirmative_exercises.pdf
    • http://usene.xyz/3952391952724llf.pdf
    • http://excellent-spb.ru/76531208571xqw79.pdf
    • http://help-copyrightservice.xyz/air_force_rankslplt3.pdf
    • http://infokurs.design/rivimijuxesazamegeqwxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wetovokerug.epizy.com/netgear_fvs318n_port_forwarding.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_628c72dc5960406ea81287ed1dd29fde.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_998a74b5e50943cb9b47ecd47c007b54.pdf?index=true
    • http://bagitokukuwulo.epizy.com/28766123473.pdf
    • https://uploads.strikinglycdn.com/files/23b62513-3d64-4bcb-8c09-b5bd3ce4ade8/33211636378.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/atomic_mass_of_first_30_elements.pdf
    • https://uploads.strikinglycdn.com/files/52c954a9-78d6-4dac-a760-363333345f97/58644381830.pdf
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_5dfc9f0390744d6ba403d198d064d199.pdf?index=true
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_0fc28162a5474ede85a4faa951cd3929.pdf?index=true
    • https://s3.amazonaws.com/jipowumat/battle_royale_pc_no.pdf
    • https://s3.amazonaws.com/lofese/episode_guide_chicago_fire_season_8.pdf
    • http://latilofu.rf.gd/13189181827.pdf
    • http://kakogajoxe.epizy.com/porque_los_derechos_humanos_son_universales_incondicionales_e_inalienables.pdf
    • https://s3.amazonaws.com/firudegix/wallpaper_photo_gallery_hd.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_off0000e1af.bin
dd7aaa3f5edf121b3768c2f54f431c2a4c7f5edd7e0c2d46406a228ff1a78a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 4992 bytes
font_01_sfnt_off0000f299.bin
59df052a68412400873b36f6243367892a687ef349923f30d73353ac7df34967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 11564 bytes

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