Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f8ad5a8139d80c…

MALICIOUS

PDF

72.5 KB Created: 2021-03-23 05:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9a35edad44daf354f3e9af9c0ea37fe2 SHA-1: 5bfdfe183985253e953486bd307b483bae5a6972 SHA-256: 03f8ad5a8139d80c30c336c82d1936cc0267f366be0e1ca1bb71c616e2fc08ff
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one that appears to be a link farm on disposable hosting, suggesting an attempt to distribute malware or phish for information. The document body, though heavily obfuscated, contains text related to song chords and PDF metadata, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=amazing+grace+my+chains+chords+pdf PDF link annotation
    • http://rugegav.mywebcommunity.org/mercedes_benz_e_class_2020_manual.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/120037.pdfIn PDF document text
    • https://cdn.sqhk.co/vikaxokaso/giewOhb/groupon_payments_merchant_user_agreement.pdfIn PDF document text
    • http://wineninuxusafu.22web.org/78121315537.pdfIn PDF document text
    • https://wilibupa.weebly.com/uploads/1/3/2/6/132681560/b708c64f2.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/repodu.pdfIn PDF document text
    • http://lotiruwibek.iblogger.org/jipilasugiful.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/mitebi.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/7030542.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/sewofusamotowotafijaw.pdfIn PDF document text
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/movodalalozotisa.pdfIn PDF document text
    • http://pozesex.iblogger.org/tegoko.pdfIn PDF document text
    • https://genolawibiwiz.weebly.com/uploads/1/3/4/3/134316454/womawumena.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/gghjigy/xekimise.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/gilajegatenomavera.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/hjejjid/smith_s_las_vegas_weekly_ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mageparojepu.epizy.com/funajafiroguxokegu.pdfIn PDF document text
    • http://livukuxuperum.epizy.com/fonujidagapekivaza.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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 5680 bytes
SHA-256: 0601006ee562591f41f7dbe93da76f1553a7245eab4b374d3a8253413ab3c4d2
font_01_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 10560 bytes
SHA-256: 4d5425b2f74654137e32ff43f5288fd834c5167fb6b37b98b14a7d6f68d579d6

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