Malicious PDF — malware analysis report

Static analysis result for SHA-256 855f3b69b233edcc…

MALICIOUS

PDF

76.8 KB Created: 2021-02-11 10:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e4e766d14c093d1898fbd977ae26b320 SHA-1: 7d2433cd3c90ec218c46e486d07d0309092c95b7 SHA-256: 855f3b69b233edcc89e1d2ad91ed53f0083de367833a7518dca9caf83fd97ba3
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

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 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://druttle.ru/123?utm_term=foil+in+literature+examples PDF link annotation
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/bonaxonor_sureva_fotubemuzubav.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/misikuvezup-rutefefakedig.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/viboz-wibisadoni.pdfIn PDF document text
    • http://pevetune.66ghz.com/fuvedezatovome.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/nofud.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/8123959.pdfIn PDF document text
    • http://jenirafona.22web.org/brazil_flag_information_in_marathi.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://s3.amazonaws.com/dovulavavo/aliens_versus_predator_2_game.pdfIn PDF document text
    • http://joxesovifelerav.epizy.com/14973838139.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/concrete_mix_design_lab_report_discussion.pdfIn PDF document text
    • http://baxojusijopigas.rf.gd/74629691047.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/symantec_dlp_endpoint_discover_datasheet.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/sheet_music_erik_satie_gymnopedie.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/impetigo_herpetiformis_dermnet.pdfIn PDF document text
    • http://bewefesa.epizy.com/essay_outline_template_high_school.pdfIn PDF document text
    • http://nuduguzafasu.rf.gd/81271318211.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/nerabudumaguxisu.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_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 4872 bytes
SHA-256: e7396f9a783158fa67b8a986359ce18048a2e62ee893085d32eca2f1d0a3c165
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 11736 bytes
SHA-256: 3030ad075c7bcd2c9ac31f94a8236a6b6eb4376fb918e1a176588b48d1b8ea65
font_02_sfnt_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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