Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f0572ccac5ab39…

MALICIOUS

PDF

81.4 KB Created: 2021-01-21 16:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e79a7d09d571f33f3d821046d087a67 SHA-1: f44841edde402e97e1103fb9143cdaeba6eeb6e5 SHA-256: d4f0572ccac5ab3958a58137a52021aeabb674e363b53470642472e2896056ea
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'mod among us maps mcpe' and 'wkhtmltopdf', potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://jottigo.ru/wb?keyword=mod%20among%20us%20maps%20mcpe PDF link annotation
    • https://cdn.sqhk.co/surodamiz/6qqjfib/54944195290.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ghhxPgj/is_the_cn_tower_open_on_boxing_day.pdfIn PDF document text
    • https://site-1166610.mozfiles.com/files/1166610/56594854745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_6008c9fd074a7.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/djdBwpG/34230879567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5ffa5b07837e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fbc67d28478a.pdfIn PDF document text
    • https://site-1084156.mozfiles.com/files/1084156/weekly_planner_printable_tumblr.pdfIn PDF document text
    • https://site-1201036.mozfiles.com/files/1201036/gazowozuro.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/cgiifjd/stickman_football_the_bowl_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5fcd2dc4bc468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370284/normal_5fe3ba934bd8c.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/ijhihjd/play_rummikub_online_with_friends_without_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5f933e3dc3e16.pdfIn PDF document text
    • https://site-1166701.mozfiles.com/files/1166701/commando_zombie_killer_zombie_sniper_shots.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/OghCQR2/cat_ears_headband_target.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/chiheVS/91004706491.pdfIn PDF document text
    • https://site-1175608.mozfiles.com/files/1175608/eco_sound_recorder_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/viwoxuz/75907237123.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/ielts_plus_2_reading_test_4_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/21032762967.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/live_channels_android_tv_dvr.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 5024 bytes
SHA-256: 902d6826e4b74fc62ffa476c62d617611d07c985d616f487bdd3f8af05389e37
font_02_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 2140 bytes
SHA-256: 289854c0292170102eeea8cd8d9fa039b7e5adf06f71653ea533c14c4e2d2c34
font_03_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10396 bytes
SHA-256: 9d3005fa502594dded8bee6c68b5058eefbeebcc3ac46a4c72108552dcafb61c
font_04_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16148 bytes
SHA-256: 36f0f7c847a3d257bca3513ae5362ff552e89fccc363f2ec096b83b555007b24
font_05_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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