Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0898186ad5f4597…

MALICIOUS

PDF

81.1 KB Created: 2021-03-13 17:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6be065b52bb2314991ebcae6cb25554f SHA-1: cefe74da5f70c98dd5dbc790cd1d3a6fbf10c039 SHA-256: f0898186ad5f45976a7c930ad11f269cfbbac3ee96b002d9438efa9171785b64
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to university admissions, aligning with phishing tactics. The presence of external URIs indicates an attempt to redirect the user to malicious content or download further payloads.

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/award?keyword=quaid+e+azam+university+admission+form+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fd664f6bb8ad.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/8344b0bff6bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_6035c4ed934c0.pdfIn PDF document text
    • http://mivoliji.22web.org/amarasilpi_jakkanna_telugu_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5fecc81d570ea.pdfIn PDF document text
    • http://faromobipon.22web.org/23831876738.pdfIn PDF document text
    • http://kovokowem.iblogger.org/nibibediwogusozosugu.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/9677900.pdfIn PDF document text
    • http://meboxofunufox.iblogger.org/26336399758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_5ffcd448ab8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_6046fb5616882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_45a8130ab650452b8714236bd46bb5d3.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_01914e74f56842e492d032512f9bfa9f.pdf?index=trueIn PDF document text
    • http://xaxuvep.epizy.com/button_background_color_code_in_android.pdfIn PDF document text
    • http://mojofukiw.epizy.com/37032804256.pdfIn PDF document text
    • http://sumokunuz.epizy.com/fatixasa.pdfIn PDF document text
    • http://beruwawi.rf.gd/navy_blue_quilted_jacket_with_fur_hood.pdfIn PDF document text
    • http://vugixemavofagen.epizy.com/gumorotatumumek.pdfIn PDF document text
    • http://xojurasonalefan.rf.gd/black_and_white_organic_crib_sheets.pdfIn PDF document text
    • http://fovusuru.epizy.com/shobde_shobde_al_quran_download.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_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 5428 bytes
SHA-256: 656574afb7a901a6cfbe427c34c7d5aca9ca54262613e5e68690e66fa46be0b4
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 11560 bytes
SHA-256: 00cd1db3521a228d0b9cf4acf9dba1576a05b07eae333219aeea35f7c73c308d

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