Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8d7b2ba39a4f71…

MALICIOUS

PDF

71.6 KB Created: 2021-02-22 05:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e4f8999516c042ef2b906e335a4c11ad SHA-1: cf9d1cb08683ddcdb82dfbf1ad550635009ab245 SHA-256: 1e8d7b2ba39a4f71b50ba75ea4914873129b56c27d9fc236b70b5998d6fed434
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link at 'https://yafferge.ru/wix?keyword=glencoe+health+chapter+4+answer+key' leads to malicious infrastructure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests a pattern of using disposable hosting for a large number of links, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or malware distribution attempt.

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=glencoe+health+chapter+4+answer+key In PDF document text
    • https://cdn.sqhk.co/muxuzoxipopa/g7OjgOV/50098028137.pdfIn PDF document text
    • https://fupotitora.weebly.com/uploads/1/3/4/8/134883452/sosaripow-wopazazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5ff9c41a58604.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/heTgfhc/larijosigigupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_602f8e0873f45.pdfIn PDF document text
    • http://detonic-buy.website/tizulujigogoduwujovf7a4g.pdfIn PDF document text
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/mesaribox_zovazuxi.pdfIn PDF document text
    • http://consequences.space/nugomiduzotijesedulidomak4mp.pdfIn PDF document text
    • http://mignonette.space/56270439697f5va2.pdfIn PDF document text
    • http://mikrotikwizard.com/dukodimazironifog8xlyw.pdfIn PDF document text
    • http://leree6.club/hotel_california_piano_sheetejr10.pdfIn PDF document text
    • https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/8963945.pdfIn PDF document text
    • http://guitar.su/zuxixulivimagenezibadegasv0ku.pdfIn PDF document text
    • http://lalashoppen.online/the_little_prince_summary_movieuy3rn.pdfIn PDF document text
    • http://neyroskakalka.site/spinal_stenosis_nhscpyjd.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/6688bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/hangout_app_for_windows_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/neolithic_houses_information.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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 5396 bytes
SHA-256: 56cc8b0ee3e8e32ca6afcc60e8e10968f08ee9434d1cb3351f7f44a65f4cdbe2
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 9840 bytes
SHA-256: b2454d3621bbf5124f0650b693c14b713b185dc4f9cb8955251c8b83aba91895

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