Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64eb4d23a92772b…

MALICIOUS

PDF

78.2 KB Created: 2021-04-07 07:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d31afcf5c7b6ecfcd9a4922d6e2224 SHA-1: dde41ceec04f2883aca79b5c7d309bebd5f3e190 SHA-256: f64eb4d23a92772bce0c6135e381b71fc15101bd66033c4007542219175a9331
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests an attempt to redirect users to potentially harmful websites for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=swim+lane+process+map+template+powerpoint
    • https://cdn.sqhk.co/gofelaxes/hO4hhx8/c_h_a_s_e_d_unscramble.pdf
    • https://cdn.sqhk.co/sisagoku/gzjgijb/nabofepute.pdf
    • https://cdn.sqhk.co/lozuzupadis/dblhaje/offline_2_player_games_xbox_one.pdf
    • https://cdn.sqhk.co/wesuwajil/yfFYQgc/wogezalabaxuvebovavurelu.pdf
    • https://cdn.sqhk.co/gabironero/fehbN6H/stack_smash_2020.pdf
    • https://cdn.sqhk.co/jivazufevi/ifggSgi/parkour_maps_minecraft_xbox_360.pdf
    • https://cdn.sqhk.co/joxomawezu/jjgjijQ/adafruit_audio_fx_sound_board_troubleshooting.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_509f9791bd2042348106f220c455e30e.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_3a091bc5e3b149fe83f76b8c46077128.pdf?index=true
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_eba413cef84f495e8d6584e3b7c68904.pdf?index=true
    • https://s3.amazonaws.com/wunojipu/examen_de_comunicacion_tipo_ece_para_tercer_grado.pdf
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_dd57773bf5c44daaa26825ecb5a28ced.pdf?index=true
    • https://s3.amazonaws.com/xafaxotaful/72430166870.pdf
    • http://sosozodazu.epizy.com/is_ac1200_good.pdf
    • https://s3.amazonaws.com/litunux/logic_pro_x_free_template.pdf
    • http://tubunul.epizy.com/carry_on_my_wayward_son_guitar_tab.pdf
    • https://s3.amazonaws.com/gewisetug/86396273808.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_ead184b9c8d646989874f0cdcabba573.pdf?index=true
    • https://s3.amazonaws.com/kovibu/defiant_motion_sensor_light_blinking_red.pdf
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_d47c2f044a6844b4abbb9585edca45db.pdf?index=true
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_36448246fe7344c3855cd18a1cd6c370.pdf?index=true
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_de56d9b9ce2c4405a81440887d4baf1e.pdf?index=true
    • 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_off0000f199.bin
e4949c75a493d1c08adbca3ac56c61460140edaed12fc2a5402ed17e56d5d8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 5276 bytes
font_01_sfnt_off0001037f.bin
601902b59aec164069393af96fae86598a9c3d312b6b64599c95b8cf71fdf548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 11372 bytes

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