Malicious PDF — malware analysis report

Static analysis result for SHA-256 984042ad125f7cd9…

MALICIOUS

PDF

77.0 KB Created: 2021-03-10 01:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7d93c5677b859c325f42baaca7f92ed0 SHA-1: 1ca59f7ac985393879abb57ba01f45f377c8b22b SHA-256: 984042ad125f7cd959648b1dbc8aa8e670011059cc4f24ba363a0bcd0f36a4db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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/award?keyword=sanford+guide+antimicrobial+therapy+2020+pdf PDF link annotation
    • http://xofelivigavas.mywebcommunity.org/bipolar_adalah.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/judomalodupisanesawavaxa.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/brown_bear_brown_bear_coloring_pages.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/0438c75cf054.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/28645401968.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/bbeb10c1ce78.pdfIn PDF document text
    • https://bogemokized.weebly.com/uploads/1/3/4/3/134386998/podazizuv-jogujawe.pdfIn PDF document text
    • https://fenibelamej.weebly.com/uploads/1/3/4/4/134464240/pawafuzok_bodin_texidivuvotoza_fewafexemokuje.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/eb259ec7-84b4-427d-a15e-718b48ce7803/vomovazesikoxixosole.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/delhi_police_admission_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/probability_questions_and_answers.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_42a355a9bbe149c1a814254fce4aab14.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_9e51c9eb83454e43b77cbfb786fcb449.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c016475-fe3e-4ebc-84f3-42b634c92303/surface_area_of_composite_3d_figures_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce07cade-b6e2-4165-856c-440f0c97919e/15688157628.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_a25ea7ad3718438fa19e774dfda56bf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/nakopujolovazuruwis.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/5889127159.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/borafezejaji.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_b86c85f1c5434d9fb9fa49183c465113.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farokof/84727705537.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/33589572202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbc19dd-6362-43d5-b95a-9e5ab83bf80c/59818107721.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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 6012 bytes
SHA-256: ec5cbdd7c3104bb6d301748380ca3efc93624311f87dcb49e1acede326926155
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10408 bytes
SHA-256: bf652b1e84644e7c4f8c365a9c92ccfe650240102078e9d86ff9be40edc0cd57

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