Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c106d5cda9de34b…

MALICIOUS

PDF

71.8 KB Created: 2021-01-14 05:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900ebf982766e66e30b80b8bc328e1c4 SHA-1: d36724c001108b8397539935a4591d86c5ea9983 SHA-256: 2c106d5cda9de34b991a1a636e284414904ae90ff6bed0ac1a19c7aeb31a35d2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution intent.

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
  • 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.
  • 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/123?utm_term=ayer+t%25C3%25BA+no+%25281%2529+a+la+fiesta.+todos+los+invitados+%25282%2529+por+ti
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/gubuvewigesamefotugi.pdf
    • https://site-1172267.mozfiles.com/files/1172267/monkey_fire_type_pokemon.pdf
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/gikig-wejewidetu-ruludopusunar.pdf
    • https://site-1084296.mozfiles.com/files/1084296/galaxy_shooter_2018_space_attack_cheats.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f908af44d1a7.pdf
    • https://site-1175062.mozfiles.com/files/1175062/fill_the_glass_without_touching_the_dish.pdf
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f871339cff73.pdf
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/1a75d3a3ab9e67a.pdf
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/gekofikitirom_dawaguxixuz_zakuvokusivobis_kagavuvowumeni.pdf
    • https://navubuxodogonid.weebly.com/uploads/1/3/5/3/135327143/givuxavizafumuken.pdf
    • https://site-1216774.mozfiles.com/files/1216774/carga_segura_express_comentarios.pdf
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff969432169b.pdf
    • https://cdn-cms.f-static.net/uploads/4375699/normal_5fc156fa8fe2c.pdf
    • https://site-1171989.mozfiles.com/files/1171989/plague_inc_how_to_unlock_everything.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d6ba.bin
1721c88e33a2a6f458b927fd5ee4c743830dbedc8a9c111db884fa767e181605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 5672 bytes
font_01_sfnt_off0000ea14.bin
090e285aab9839d097a3a3e0683da3f8f5e990ba47f12a6e30975348079e7a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 11328 bytes

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