Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d58be807f1e3b6…

MALICIOUS

PDF

82.1 KB Created: 2021-03-16 15:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8048a619d23fb8ea09a1d7e2643d8739 SHA-1: 8ef365abb6ae8b264d84b57c7b76da96043e1e42 SHA-256: 35d58be807f1e3b6c1596abe286a4bc412f836d8ad3d6ea5c66205e1dde8d8c9
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which point to disposable hosting and appear to be part of a link farm. The primary URL, https://nipisod.ru/strik, is presented with a 'utm_term' parameter suggesting a lure related to 'Macbeth act 2 scene 1 analysis'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=macbeth+act+2+scene+1+analysis PDF link annotation
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/6363593.pdfIn PDF document text
    • https://movidotibapokab.weebly.com/uploads/1/3/4/2/134265591/guzavotij-vaxamomidesur.pdfIn PDF document text
    • https://babewepuk.weebly.com/uploads/1/3/4/3/134311046/meburiralamapepupuxo.pdfIn PDF document text
    • https://subozabi.weebly.com/uploads/1/3/2/7/132710736/5729832.pdfIn PDF document text
    • https://jatowuwovusi.weebly.com/uploads/1/3/5/9/135981640/a590343cfbc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6608d49-d22a-44a3-b605-32ab44aceca8/letter_from_birmingham_jail_study_guide.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_b1da905377fa4b069febdde0ca68a78f.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_5997a7dd63384e969939dc6ccd74768e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd78eb70-3a0a-4c65-a75f-73d15ba60cfa/best_warrior_cat_clan_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4d65a9-fa1d-4f9e-88b2-ad4f58d4c845/jowomitijifulupodofuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8396b151-365d-43c7-b5df-ca54aa993f7a/margin_of_safety_managerial_accounting.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_83772847fa744605b3db9494f4ecf028.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c9ee3f-4efb-47ca-83e2-22356606d66c/boy_scouts_lawsuit_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401375ad-9f2f-4359-bc3e-5ed6c3dbebd4/jotixeguwob.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_37ce3cd58671406aa32d89d422cb8094.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e427c506-4e39-48f3-ba67-c9e8d0967884/fundamentals_of_nuclear_science_and_engineering_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453f2c04-d4b0-4ef2-ad28-390cd6d1516a/salewebaxipuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440ea6e8-3198-4932-b9c3-05b3e654f74d/68041883206.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_bebdb7b3a4a04b5c809717e3c12b8ead.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c4a644-acff-4ccb-b87b-5cffa97afb99/difoxajegetetanexekuriwif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b20a6c7-d64b-4959-afbe-39462abff289/bissell_powerforce_helix_turbo_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50859357-aedd-41b5-b408-baebdc33210b/maquina_de_costura_brother_ce_4000_usadas.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_a780c4f2d2bd4a4790b657a67b9d1091.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_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 5220 bytes
SHA-256: 8480f778f99179f35c3c693b5c2825944bd5b4282feed0287300a674e5d10e09
font_01_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 10736 bytes
SHA-256: ca1defb028a5e2cac79c07104df350c946b709d25706f8b61f882397711c5526