Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d94ef4659ce4ac0…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 04:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a60c0924c88e361cff9b3819de37f103 SHA-1: a36d9411ce24176f819be3c61e3fd1f231c85624 SHA-256: 6d94ef4659ce4ac02381c53c071f2740b8a645691db29300dbec78b6dcab638e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the PDF structure itself is designed to redirect users to a large number of external sites, likely for phishing or SEO spam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/aws?utm_term=scotsman+ice+machine+cleaning+youtube PDF link annotation
    • https://cdn.sqhk.co/rimudatige/gfgfCz9/vuwowogesatinulumat.pdfIn PDF document text
    • https://cdn.sqhk.co/tedemibane/pidgdED/ligemepaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_604de7130b10b.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/uididb8/leappad_platinum_youtube_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5ff83305d94da.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/gjidvYZ/vifarofe.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/8C7ichi/write_thai_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6047cb9f605ff.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/es6qEkv/us_political_news_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_60205fd96736f.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/gdgiQha/98950293947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_6029f54144aaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/jhoQNmC/bouncy_dunk_y8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_6025e132564c6.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jfzhipu/galaxy_on_fire_2_pc_dlc.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/WYijiXU/91149125755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuruxiwowasigu.epizy.com/fight_club_full_movie_hindi_2006_hd_free_download_filmywap.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/33174767523.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_cda01160d12c45618232611d8f6cc54f.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_a33067fd6f37449e8b69aa24f79cdb23.pdf?index=trueIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_f2a54a7610d7488a8461c57a2ae15a54.pdf?index=trueIn PDF document text
    • http://papixunaz.epizy.com/palmistry_in_urdu_book.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_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 5460 bytes
SHA-256: a277c37484a5b0c994697ad34418743ecfe5d609f28de4e45aa45a2232e98c8c
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 10912 bytes
SHA-256: 286613e4cbc26291a0ddd00db986b33ca040cb7d14acb8ff0ca837c2fd6adb42