Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd5821038b26e0a…

MALICIOUS

PDF

84.1 KB Created: 2021-03-20 08:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8cf220c7da1ba67bc531d5b9b441c34a SHA-1: ba763f42a7790af335c1b0f510facb95e95bd378 SHA-256: 5bd5821038b26e0acf70519e75336fb4a21155ee34c7bf3f4c229756c39685f7
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or phishing lure, evidenced by a large number of external links, many hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is weaponized to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://vilenefex.ru/strik?utm_term=percy+jackson+cast+movie+1 PDF link annotation
    • https://cdn.sqhk.co/burajugi/DGggiia/97634636051.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/HjijcMQ/kotodi.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/piriformis_exercises_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/JoZlge7/12230587767.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/how_to_structure_a_character_arc.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/kgezheE/recette_sandwich_vegetarien.pdfIn PDF document text
    • https://cdn.sqhk.co/luzeginu/cJidbie/centos_6._4_iso_image_free.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/depigibevokaku.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/bihghJP/3212156076.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/j4BhJXp/52161560275.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/aBc9hek/87446946890.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/eIz5dhc/nugigusidofazuvupeg.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/how_do_i_access_wd_my_cloud_on_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/WjcdhbU/sound_physicians_emergency_med_of_nevada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_ad7976d5aa704b6592cc11dd0051f3b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/971a0cd7-9ef0-4ed1-949e-9897792367fd/85709458613.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_8de8220790594cbd8c91bd5e19773bd9.pdf?index=trueIn PDF document text
    • http://feferabi.atwebpages.com/15940197118.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_86bb7883213a41f785fb3329f254c68c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f85b1b-0547-4160-8085-3dc14e43aa1f/29017050948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ba7a42-989d-4a43-9fcf-00c45af5970f/43180978048.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_6845a8239f474c26bb95ae0dd8046036.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_9b6810ab9af34d6ba8e2988fad2e7418.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_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 5268 bytes
SHA-256: 80b1abe791ed418feca0861c8b9ea7e445728e933e165cd451c00a962aba5680
font_01_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 11340 bytes
SHA-256: 26a5a970dc0f4bfc83032768f2e86a0dd44f774692d91787dcfb4a6fecb1fad9