Malicious PDF — malware analysis report

Static analysis result for SHA-256 4027e64427d2376a…

MALICIOUS

PDF

68.7 KB Created: 2021-02-15 22:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 766acacecd41c1b1c33e2e02a73f532d SHA-1: 4d2882dab580b42095e37c9c27be7b03ade9cc0c SHA-256: 4027e64427d2376a90579aa8c669135c2403dbd7290db06f0fad26fbc57cbf99
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Biblia de estudio reina valera 1960 pdf gratis', suggesting a lure to trick users into clicking on malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=biblia+de+estudio+reina+valera+1960+pdf+gratis In PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/datepovevovujire.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/r3khjcq/hideo_kojima_twitter_spongebob.pdfIn PDF document text
    • http://jebumivusesujan.iblogger.org/singapore_immigration_questions_and_answers.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/journal_of_public_policy_implementation.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/bjbG0hc/simplenote_windows_portable.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/filajidejugagiw.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/aa54f.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/newates.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/rijimire_suzisolasuju_kuranopa_poxova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setowibuvi.epizy.com/mosavijefudubaxurifafa.pdfIn PDF document text
    • http://kiluwemejibe.rf.gd/low_back_piriformis_and_si_joint_pain.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/south_hd_movie_filmywap.pdfIn PDF document text
    • http://kamegowemegoguw.rf.gd/spelling_word_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/xuladutelaxorekox.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/teluvofitonatexosepizo.pdfIn PDF document text
    • http://gawadatij.rf.gd/65049199864.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/vijesuvedipidef.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB899 5964 bytes
SHA-256: 01bde6802a1017ca6e58b1f6cc75a6dbf419ff279ed7fb2dba1a4c71c2938ac0
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 10252 bytes
SHA-256: b0c200d7245349bb87c4137e65019fbe2d94618afdcdccc8f72b8d665087850c
font_02_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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