Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a308aba4bd83d99…

MALICIOUS

PDF

89.0 KB Created: 2021-05-16 19:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f1a4d9b1256317383310b3f22318247 SHA-1: 2993004d9ff4f5fb50a2424f14e0d422e76004a1 SHA-256: 2a308aba4bd83d991fe36e9f704384d5be2315e19953203683a913eb5f35f9fc
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. It contains a large number of external links, many of which point to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and embedded URLs indicates an attempt to direct the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=what+is+meant+by+air+standard+cycle
    • https://cdn.sqhk.co/tosuwukiwate/tgfhgjc/30902256672.pdf
    • https://cdn.sqhk.co/xawobovuji/AhiXhd6/15145901840.pdf
    • https://cdn.sqhk.co/bozogekeji/Egf9ida/83760252347.pdf
    • http://jugebusas.22web.org/battlefield_1_save_game_for_pc.pdf
    • http://nuwoxope.iblogger.org/28508829812.pdf
    • https://cdn.sqhk.co/zujumatatub/ge8QghE/zombie_herobrine_skin.pdf
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/jevawug_zunizitaxawiwa_xajonup_vufaku.pdf
    • http://wedipum.mygamesonline.org/how_to_fix_no_icons_on_desktop_windows_10.pdf
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/3060910.pdf
    • https://cdn.sqhk.co/zodavujera/gdKje8S/tangle_teezer_wet_brush_on_dry_hair.pdf
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/60f32315195.pdf
    • https://cdn.sqhk.co/woteruzid/cshfhcH/the_richest_ice_hockey_player.pdf
    • http://tafagejiveduda.22web.org/wajigavegebujiz.pdf
    • http://rabemedexisubis.mygamesonline.org/zanejemarululakiberoluwum.pdf
    • https://cdn.sqhk.co/depivuni/gfjekjg/64873875134.pdf
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/5f8f6a.pdf
    • https://cdn.sqhk.co/biposuba/hjhdFja/635337288.pdf
    • http://mukinumatonewo.getenjoyment.net/chemistry_density_problems_worksheet_answer_key.pdf
    • https://cdn.sqhk.co/dugelabomaw/Hjbihgc/uefa_champions_league_calendar_subscribe.pdf
    • https://cdn.sqhk.co/dovepomazeri/cgfhdmz/hitman_2_multiplayer_co_op.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://limufij.myartsonline.com/lusalatilisetasinexid.pdf
    • http://maxegore.epizy.com/psychology_of_color_green.pdf
    • http://vobikeretuwof.atwebpages.com/acute_renal_failure_in_dogs.pdf
    • http://vufepaketotaxo.epizy.com/apa_paper_format_example.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_off00011e99.bin
6f774f8548e88ff62a15727344d81e290dfa9946158164b5704365774ca36566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 5436 bytes
font_01_sfnt_off000130f5.bin
0570ae64563de9519f94096aa597fc2ca79796c1e99d3cbb00a0aff3e60589a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 11136 bytes

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