Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a79ae4452578ff…

MALICIOUS

PDF

102.7 KB Created: 2021-03-24 05:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4275ba838accf4fe7c95408989a11e95 SHA-1: 24bdc09fb53506286df8319af3b41f2529493ead SHA-256: 71a79ae4452578ffbd5dc5f99a52233da128baf723c6129f24b0e5212217e68a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing and SEO link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=adblock+plus+for+torch+browser+free
    • http://goladelexugezi.sportsontheweb.net/45976564960.pdf
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/vatajujul.pdf
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/relefevifazuwiposu.pdf
    • http://xesapuwax.mywebcommunity.org/apostila_auditor_fiscal_da_receita_federal_download_gratis.pdf
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/6993846.pdf
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/15d7406a2840d.pdf
    • https://xorowime.weebly.com/uploads/1/3/5/3/135307705/3822669.pdf
    • http://wejuveziwep.mypressonline.com/34642277219.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_61486d8dd69e40d08bb062a4a9f011d9.pdf?index=true
    • https://s3.amazonaws.com/jupoti/gujatijulemawizetafepe.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/70419121998.pdf
    • https://s3.amazonaws.com/padosumifubobo/katatuj.pdf
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_2573fd06573c44b2988b6e22f6b89279.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_912542f4afe14033b060f494803d222e.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/business_administration_interview_questions_and_answers.pdf
    • http://vefodipox.myartsonline.com/91608278656.pdf
    • https://s3.amazonaws.com/mefonevimimix/52065088069.pdf
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_53a6b5055b0245639498f4e9d837045f.pdf?index=true
    • https://s3.amazonaws.com/lotibabakuj/nelapuvofubeki.pdf
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_f49ba0dfd5a348bdb743d6a61c0a34a8.pdf?index=true
    • https://s3.amazonaws.com/tutapaxi/zisufudonugateborani.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b71.bin
884f79cdda166095c7cac2145a5e254054f7b7d90957bb1a8787685883a1dc9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 5316 bytes
font_01_sfnt_off00014d93.bin
0a2eb9672cb6e82ca6853ca04009c974ac1f8137258127cd5cb25bb01e47b9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D93 10904 bytes
font_02_sfnt_off000172e3.bin
2e2406a23c4eda4333e1700c11bf9bf530ea6b24fb47f233129a6652b68d8e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172E3 17444 bytes

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