Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad0553d0b7adaba…

MALICIOUS

PDF

69.6 KB Created: 2021-02-24 06:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2984fb8b66cc41ae0f3b54b7526e5f01 SHA-1: b0cc1818cd86f515ecaa9407aa09a4cbe50cc746 SHA-256: 2ad0553d0b7adaba2917e9889811fcbda8bc58fbe9ca32a6ec8f258d59251ef2
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'Bagong silang caloocan city zip code' and authoring information from wkhtmltopdf, suggesting a lure to a malicious site. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a phishing or malware distribution vector.

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/wix?keyword=bagong+silang+caloocan+city+zip+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_601886c105d43.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ifiaifI/36780394824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5ff91fd6b9b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_6032c0c9a0391.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/fhehhjj/linear_function_examples_table.pdfIn PDF document text
    • https://nibonitet.weebly.com/uploads/1/3/0/7/130776737/6bc2f0f1df.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/DjiLrF8/classwork_zoom_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_60111df33ade9.pdfIn PDF document text
    • https://memibufosigi.weebly.com/uploads/1/3/1/3/131383384/kebit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_60261fd975e6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fc87305b589a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanesipub.rf.gd/dagshai_weather_report.pdfIn PDF document text
    • http://rigozapovi.epizy.com/ets_gre_book.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/61036172700.pdfIn PDF document text
    • http://pugapugene.rf.gd/35322647462.pdfIn PDF document text
    • http://bopebafelakab.rf.gd/demonirat.pdfIn PDF document text
    • http://zupifimiture.rf.gd/is_behringer_speakers_a_good_brand.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/verulekopumuzujajexev.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/ophelia_the_lumineers_piano_sheet.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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 5344 bytes
SHA-256: b591baaffd93433a198a3438ccd179a5b65084717fef0c9201bdc0ed27a4c48f
font_01_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 10708 bytes
SHA-256: f1ab23a54a0d89737cac025ffbf9202b1702d5175caabda28215651d24578011

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