Malicious PDF — malware analysis report

Static analysis result for SHA-256 21add1164c4dd468…

MALICIOUS

PDF

92.4 KB Created: 2021-05-29 02:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 79a9889e77cca41f9690aa3acb35e2ef SHA-1: e8fd1e51f6f6643eef6080f183848c641d2e8138 SHA-256: 21add1164c4dd468a485b7622c3af18c807fdc06f1aafb1b6a236af92930db54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=scholastic+success+with+reading+comprehension+grade+3+pdf PDF link annotation
    • https://rosafuzumago.weebly.com/uploads/1/3/1/8/131857847/2869345.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/1983255.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/woxuvazexexot.pdfIn PDF document text
    • https://nekurunezofadi.weebly.com/uploads/1/3/4/8/134892804/535ab.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/lusuzarubozo_rubuxunu_sisuxa.pdfIn PDF document text
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/gudaburage.pdfIn PDF document text
    • https://wevoforu.weebly.com/uploads/1/3/4/5/134591306/lopuninus-vesajesuwivu-bomimo-kojum.pdfIn PDF document text
    • https://vadunidiv.weebly.com/uploads/1/3/4/4/134464125/lezibupesolezaz.pdfIn PDF document text
    • https://nitelozam.weebly.com/uploads/1/3/5/3/135308565/8b70b42d13.pdfIn PDF document text
    • https://goluluvofa.weebly.com/uploads/1/3/2/7/132712214/8623271.pdfIn PDF document text
    • https://palufiboninu.weebly.com/uploads/1/3/6/0/136020493/483ff8.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/50c397c3b.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/jadakawowanejakote.pdfIn PDF document text
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/xumegesesige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bacf9912-9bfc-4e92-969c-9b0778382bd7/photosynthesis_elodea_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab88bd3-5ff8-4746-8139-c004e3a10ceb/luduramizamosaven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731ffb61-4cee-4559-9b22-04e610e46173/db2_sql_statement_syntax_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07ea7d1-4948-40ce-9e2e-8df96fe945eb/percy_jackson_and_the_olympians_christian_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253f061a-623f-4c23-af25-ef13b9dac5bd/what_year_was_my_marlin_1893_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac63ab8-4779-42e0-91fb-e83038c2e7b3/fruity_loops_studio_free_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5a9c56-4e5e-46ad-a2fd-2a95d6364683/dozukipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841afcc9-e2ac-4f51-b3cd-4b0bc12ff36c/williams_allegro_2_music_rest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b466b9-7ac6-4b2a-95b8-fb7feec37c05/46252890350.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 5812 bytes
SHA-256: d87218de2d251b03773eb23f88dfd86bf11387bf94ab51ad836e270de4d48e7c
font_01_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 11008 bytes
SHA-256: 9852269ec788639ca246464a61275e24de30c0695cc9e92f861952908f7a6bfa
font_02_sfnt_off0001538e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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