Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f8797f3ebf31c…

MALICIOUS

PDF

75.1 KB Created: 2020-12-26 18:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d2c9ca8e155abde9b618e9fb6b11b1a SHA-1: edbc3bec35e72931afbd35b4d1056fbeaa9cdcf0 SHA-256: 8c5f8797f3ebf31c1a33cbb1402a4a5bc508e0ab4213216d341f8163b7f09037
254 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms and redirectors, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics indicates the document is designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-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.
  • 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://gettraff.ru/strik?utm_term=5+seconds+of+summer+youngblood+lyrics+meaning
    • https://verosogoteri.weebly.com/uploads/1/3/4/7/134738646/5570562.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/dezivugi.pdf
    • https://cdn.sqhk.co/jekefebiba/SOKzggB/rabelakodosozeg.pdf
    • https://cdn.sqhk.co/wepenujofow/dieijhe/34__2018.pdf
    • https://cdn.sqhk.co/fasixazijaz/ghjn1ha/mods_para_pk_xd.pdf
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/zefatonapudazoruxewi.pdf
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/176efab14878.pdf
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/sulekupodadavu_veluniwivuvurap.pdf
    • https://cdn.sqhk.co/guledijuxi/dhiUAgh/steampunk_go_launcher_themes_free_download.pdf
    • https://fonutupo.weebly.com/uploads/1/3/4/7/134727000/f844d835956a5.pdf
    • https://cdn.sqhk.co/nopawuwam/bniggiK/nails_at_home_near_me.pdf
    • https://cdn.sqhk.co/ditetona/thehfja/rotation_control_android.pdf
    • https://cdn.sqhk.co/fegujajox/hhgfr5A/fruit_ninja_vr_steam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/neviwove/pivot_animation_maker_free.pdf
    • https://s3.amazonaws.com/pazerogasarinu/powershell_array_vs_arraylist_performance.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59e.bin
405e93dcacfadec2f018e4aee8e715d413c3d4469603915abc65f53673ce418d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 5412 bytes
font_01_sfnt_off0000e7e1.bin
5def290d34f73c11b399ba5c6eb530a01fc800683d307cfcfdd9382e67a62548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 12788 bytes
font_02_sfnt_off00011114.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 4324 bytes

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