Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf9bf26fa0a09ca…

MALICIOUS

PDF

76.5 KB Created: 2021-01-23 16:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a59a91de498e9374da36ace7342db550 SHA-1: e7f803ae23f0c3c3f4ed0ccfa459015d45e96aa4 SHA-256: 5cf9bf26fa0a09ca0de67f45d30bfe88147d0f4bbd8b779b29a861b26f69551f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://traffine.ru/123?utm_term=one+for+the+money+marvin+j+ashton+pdf In PDF document text
    • https://cdn.sqhk.co/lolajelor/hfiqPfW/puppy_love_my_dream_pet_game_online.pdfIn PDF document text
    • https://site-1176140.mozfiles.com/files/1176140/34595922892.pdfIn PDF document text
    • http://vabakavolageni.22web.org/munofigavopo.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/gafemiviza.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/alfabeto_griego_koine.pdfIn PDF document text
    • https://site-1172012.mozfiles.com/files/1172012/moxin.pdfIn PDF document text
    • https://site-1174373.mozfiles.com/files/1174373/denavowemurixexasesod.pdfIn PDF document text
    • https://site-1172428.mozfiles.com/files/1172428/magic_wand_company_coupon_code.pdfIn PDF document text
    • https://site-1172884.mozfiles.com/files/1172884/57120075898.pdfIn PDF document text
    • https://cdn.sqhk.co/legesizas/jd8jcjg/retro_time_pilot_arcade_game_for_sale.pdfIn PDF document text
    • https://site-1211292.mozfiles.com/files/1211292/netflix_minimum_android_version.pdfIn PDF document text
    • https://site-1178842.mozfiles.com/files/1178842/vifuribabukodewetukixu.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/6ghwCif/dofoboga.pdfIn PDF document text
    • https://site-1176454.mozfiles.com/files/1176454/guest_wifi_acceptable_use_policy_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiboleramar.epizy.com/angamaly_diaries_trailer.pdfIn PDF document text
    • http://favigagiwu.epizy.com/cid_episode_free_hd.pdfIn PDF document text
    • http://fedukiz.epizy.com/sally_s_beauty_supply_application.pdfIn PDF document text
    • http://bikilut.epizy.com/93391546411.pdfIn PDF document text
    • http://bobujosu.epizy.com/shawn_mendes_treat_you_better_video.pdfIn PDF document text
    • http://zisoramemib.rf.gd/blank_white_screen_android.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 5512 bytes
SHA-256: 9258102ec7e6594c7dbfcb1d89748c60ae644fa5ba07f25822407e8a53b861be
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10996 bytes
SHA-256: 856a5735aa1f33a1927e97fec5df991292f44d7247c8d662fc280d38435947bc

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