Malicious PDF — malware analysis report

Static analysis result for SHA-256 330973ab97e093a2…

MALICIOUS

PDF

101.6 KB Created: 2021-02-22 05:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 66238e39127178c6f9c0db7bd5a311f4 SHA-1: 18a8491bb75d51bbd67e2684d3f22299cc418e4a SHA-256: 330973ab97e093a279deb4cdc4f639c30ca6d7a6dd9335413a2b76eeaaa48912
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 other PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://seumenha.ru/wix?keyword=nintendo+nds+pro+emulator+apk+download', indicates a lure for software downloads. ClamAV and ML classifiers strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=nintendo+nds+pro+emulator+apk+download PDF link annotation
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/212039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_5fd84401bdf8c.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/bikebunota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5fe6ff4b730be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5febea347c35c.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/4296763.pdfIn PDF document text
    • http://viziwojejafukak.iblogger.org/wonikapukana.pdfIn PDF document text
    • https://wogefusupe.weebly.com/uploads/1/3/0/7/130740138/2823611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_602dd39921b10.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/mukigogugixebusuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lepefi/68412051376.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/solving_quadratic_equations_graphing_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/logo_quiz_printable_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/genetic_variation_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/afterlife_apk_and_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/sukuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/linutewexozip.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_off00015407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15407 5228 bytes
SHA-256: 744ff4c4b3aa65b6f6f028e754bfeebbd466e1d1d81b3912baf8daff210b7813
font_01_sfnt_off000165cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CC 10240 bytes
SHA-256: 541b5bb840c9f6477cd8dcbfb41169e789fd7f012eba052d53522b485ef40b61

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