Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb536938b66acb66…

MALICIOUS

PDF

115.4 KB Created: 2021-04-07 10:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6bdf85969fcaebf7050064e21597b058 SHA-1: c9570afa104b6fc22f3fb07d4d561a586ce91ad5 SHA-256: cb536938b66acb6641f7c50d51b9608bbdc924e52a3163d4c889d65de14637da
244 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, and it contains numerous links to external websites, many of which are hosted on disposable domains or known redirectors. The document body, though heavily obfuscated, appears to contain text related to 'Management of hyperthyroidism guidelines', suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://dafemum.ru/123?utm_term=management+of+hyperthyroidism+guidelines In PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/wamapuv-karuduxili-balopir-mavarokiv.pdfIn PDF document text
    • http://fringigejy.site/vibrant_group_annual_report_2018wmtli.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/hbW2jjZ/28972507310.pdfIn PDF document text
    • http://fashion-deals.xyz/62111255887dhwi7.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/WSYNNje/lord_shiva_art_hd_wallpapers_1080p.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/jjdj1he/how_to_potty_train_toddlers_with_autism.pdfIn PDF document text
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/93a5e9.pdfIn PDF document text
    • http://clobuss.ru/racing_car_game_onlinevfitt.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ginU1gd/point_slope_form_equation_calculator_with_two_points.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/48316024849.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/470b9c7c5c96a.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/707968.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/sirufurujuvagar_misevojos.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/hahchaj/alan_walker_faded_instrumental_song_download_djjohal.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/73e667935ab.pdfIn PDF document text
    • http://shop-kid-toys.online/74777975801mshc6.pdfIn PDF document text
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/kobumukamasofal.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/5920185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_e82c361b0ecf410cabff837073c8a906.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/lefakipevoxuzero.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_f820d67d41cb468fb18723a6e951862f.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_75a9105e81fd4847bb219e978121b6d4.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_89d03188a2704d3f9a9aa298c8cbce8a.pdf?index=trueIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/xatatunimajova.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_off00018631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18631 5560 bytes
SHA-256: c2da0f535457160935b12f72e1486c0cc54b4129821f5bacddb84ff8be17c285
font_01_sfnt_off0001990c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1990C 11476 bytes
SHA-256: 9ef168ec504c77e97fc8ce2627624443b394d96dc63b0a5c68f3d5bfaee49663

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