Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbbb963a68e8504…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 12:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d1d659ad265631687db0e413339992f SHA-1: 9102f3ff87f8d3e9dd2ae623022a9ca7bf0ac820 SHA-256: adbbb963a68e8504f73c2171b2e16d271ba2428388fb013a1255441cf856b95c
144 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, with specific detections for phishing and trojan activity. The presence of external URIs and a 'download button' heuristic indicates a likely attempt to trick the user into downloading a secondary payload. The SE_LOLBIN_RUN_COMMAND heuristic further suggests the execution of commands, potentially to facilitate the download and execution of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=06+jetta+owners+manual
    • https://cdn.sqhk.co/gupikekarobo/jcicTgh/gba_emulator_android_cheats_pokemon_blattgrun.pdf
    • https://cdn-cms.f-static.net/uploads/4388416/normal_602d8be06a0b7.pdf
    • https://cdn.sqhk.co/zunesunatiri/jifgifH/11204315546.pdf
    • https://cdn.sqhk.co/guzelatolina/7jgPt1d/41382167965.pdf
    • http://dawezedelofeda.scienceontheweb.net/lapen.pdf
    • https://cdn.sqhk.co/fezivabuja/cMdLia3/33965413105.pdf
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd2f0c3d40d0.pdf
    • https://cdn.sqhk.co/mibuguxinise/vgfjeg9/empire_tv_tycoon_download_pt_br.pdf
    • http://poxumanavofeboz.scienceontheweb.net/why_am_i_obsessed_with_south_korea.pdf
    • https://cdn-cms.f-static.net/uploads/4386622/normal_6020638538e15.pdf
    • https://cdn.sqhk.co/gotakavapu/hiaHjcb/define_feud_anthropology.pdf
    • https://cdn-cms.f-static.net/uploads/4485435/normal_602d9a0660643.pdf
    • http://dosaxixapaxa.medianewsonline.com/19839589138.pdf
    • https://cdn-cms.f-static.net/uploads/4372983/normal_602c4b4e9446c.pdf
    • https://cdn-cms.f-static.net/uploads
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legobegutulo/4569540846.pdf
    • https://s3.amazonaws.com/legapatatezisa/semod.pdf
    • https://s3.amazonaws.com/sedimeraxufi/how_to_breastfeed_when_your_milk_comes_in.pdf
    • https://s3.amazonaws.com/gulapore/juxuwu.pdf
    • https://s3.amazonaws.com/norozovijalu/can_you_keep_a_secret_official_trailer_hd_vertical_entertainment.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/zumibuwikajebibesorisus.pdf
    • http://gogujigasad.onlinewebshop.net/vizozubukenonegudeposaxo.pdf
    • https://s3.amazonaws.com/wukara/25111687316.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_off0000eaf4.bin
dc619fcdb47e8afa4323e19cd46a0e2c332affd1d8ecc30a5fca314d2d00f633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 5200 bytes
font_01_sfnt_off0000fc9c.bin
0570779ee5792c7bfd6c8ea3936556e70a6c832a23095fa47dd8dba765fc0094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 11672 bytes

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