Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8620ea944fd57c…

MALICIOUS

PDF

77.9 KB Created: 2021-04-09 04:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 67441164b546751b9842f7abb4e8ae6e SHA-1: ae851ff4caeb705118291597d40582a2b2274c97 SHA-256: 7c8620ea944fd57cc5db1f3dd8f23cc49d52bb77304c6ece87a4504777e3bec5
186 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 significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the heuristic findings strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://ponafet.ru/strik?utm_term=5+languages+of+love+gary+chapman+quiz PDF link annotation
    • https://cdn.sqhk.co/zirigajer/jajihM7/86514161681.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/RjdSka3/create_a_list_in_python_for_loop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5ff16995a8a55.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/9haFiPe/vegewupisofowuzatelez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_6061f21057333.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/iehg0hb/xonebujarezamafigufuzojaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/gdBZ8EB/biguzegogisojiduw.pdfIn PDF document text
    • http://govnosiakxws.online/ribef53wxo.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/VpcaIUt/one_of_my_bucket_list_meaning.pdfIn PDF document text
    • http://formblckr1.xyz/safenezejitatukofepow8cd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5fdb3a633afa5.pdfIn PDF document text
    • http://gloslides.com/deemo_switch_physicald5rii.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/gfOXhhR/amazed_emoji_japanese.pdfIn PDF document text
    • https://cdn.sqhk.co/wewuxujudu/hejgjuO/28797448653.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/VWmBUpS/free_slots_machines_for_fun_no_download.pdfIn PDF document text
    • http://hristogrigorov.com/oblivion_guitar_flute6h5qu.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/lj5ejcC/sad_anime_boy_crying_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/hC5iagd/puzzle_bobble_per_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_6051b0efe6622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_c02726a8dd5b415f9463dc9ccc41b2e3.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_a4b4b691ee18436d837025ec9857ef50.pdf?index=trueIn PDF document text
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_bd6efd1f4f314c1484faba7af022ed33.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_9a0893394b664f9a871101cc4a18575e.pdf?index=trueIn PDF document text
    • https://3abd17d4-fa0a-4afb-a42c-9ea9e3eabc7b.filesusr.com/ugd/2e16aa_ca0b1d8bc63a4b1eac1622d2c8d3e545.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 5796 bytes
SHA-256: 09430f7566258b87ad6363b98b0b689515bebb2a71beb6e80d849503174b7605
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 11404 bytes
SHA-256: b28f01d961837ef932756b7353412374d16df92393a4a99ab3dabe8b90c0d70a