Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b4251ee8a83de7…

MALICIOUS

PDF

89.4 KB Created: 2021-02-10 08:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d5b4d673afeab636365405ba262d56eb SHA-1: d82448dd75d79fdec617c0ee12463528d88466d9 SHA-256: d3b4251ee8a83de76baea3833e625f369429fd43d9911faa7b0046d605bfd413
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites for phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to artificially inflate search engine rankings or distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=carrinho%20de%20carga%20plataforma PDF link annotation
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/rikavajuguvofak_pudaf_tolifarimata.pdfIn PDF document text
    • http://liginuj.22web.org/airport_express_base_station_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451369/normal_5fcf0fd793800.pdfIn PDF document text
    • http://morj.space/sabaxodazixubinupohvofp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528915/normal_5ff6078ac47c0.pdfIn PDF document text
    • http://xazamobi.66ghz.com/17894169727.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/8ed6d34a6d97c7.pdfIn PDF document text
    • http://nowanedilado.22web.org/dipoledogugemunawe.pdfIn PDF document text
    • http://wavolat.iblogger.org/battlefield_1_apk_for_android.pdfIn PDF document text
    • http://gakivako.iblogger.org/guide_rna_design_addgene.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
    • http://lobaman.epizy.com/transformar_angstrom_para_metro.pdfIn PDF document text
    • http://nedajib.epizy.com/android_chrome_history_timestamp.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/34931625900.pdfIn PDF document text
    • http://kepinud.rf.gd/cookies_bauducco_informao_nutricional.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_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 5204 bytes
SHA-256: b710d2cbdd8ed849d259ce7fb01e0cbf283e2cdc9209a0f51bffbb7e870eeab7
font_01_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 12424 bytes
SHA-256: 7758f78fc95f55d790e5afa5879c71040de929e1f2b8f9ae5a7d20fed3d0bef9
font_02_sfnt_off00014aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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