Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21143b7fdaffae7…

MALICIOUS

PDF

116.5 KB Created: 2021-04-26 22:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c003b81b473a858b12d3d0b36418b8f5 SHA-1: f6bcb52bcea1076039f38196628a57c4de013276 SHA-256: a21143b7fdaffae7b8fbb7b5f09095d393cb6f62bf291e0dc9ecaed917dc3eae
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to domains that are likely part of a link farm or phishing operation, aiming to redirect users to potentially harmful content. No scripts were extracted, but the structure and heuristics point towards a malicious document designed to leverage external resources.

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://midufefew.ru/strik?utm_term=the+new+market+wizards+by+jack+d.+schwager PDF link annotation
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/wivam.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/1042562.pdfIn PDF document text
    • http://resimpub.com/qa_weekly_status_report_samplebo48r.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/gjiiihi/38753916396.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/bijijPd/37147094277.pdfIn PDF document text
    • http://poradoit2.site/zazavoleluxokelidib78g81.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/RigGjbc/34223513609.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/aiiibhj/damusejanapafizepepikodar.pdfIn PDF document text
    • https://metidesu.weebly.com/uploads/1/3/4/4/134492072/2336acd8.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/hfgfhas/44702060306.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/4mjghfl/vofame.pdfIn PDF document text
    • http://reassurez-moi-fr.info/gopukafadamaxrzhf8.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/hiUhdie/gogizotirinekevofimate.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/kusivumapelorasalowivebuvcxryz.pdfIn PDF document text
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/jubasijifopavo-jijedijalaxexux.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/7V55Vje/disneyland_hotels_open.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/fjgcoQH/51024872765.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/hhhg7ie/hangman_online_for_esl_students.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/zobugizutive.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/5e18c9d7-407e-4e21-96b3-2d01ee26c328/definition_of_temperate_rainforest_biome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c11b9f-8b27-499f-8a99-1ab11efccda2/is_smith_and_wesson_40_cal_a_good_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e4dfcc-cf3e-4cf8-91bc-77a3502aa124/28040247786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e551cea1-7fdf-432f-bfad-14f82846d406/zofinimumemuforalodumixeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c5de4a-2efd-4683-8b34-e97fb7601015/my_roku_3_remote_wont_pair.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_off00018732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18732 5824 bytes
SHA-256: 67af7e7676a310f881c09fb2b59e4d3e5676e40499ac9b1ea11317215b4adbaf
font_01_sfnt_off00019af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AF7 11800 bytes
SHA-256: ee4b4e9619c145966680bc80c19a50befee336761f85aa8fcc5f02db6ec92619