Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceaf8d46f52e02e0…

MALICIOUS

PDF

74.2 KB Created: 2021-04-05 21:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b28cbd0332625f40e8beaadab54135e9 SHA-1: af116bb5d47d89866fdb7ea629925518be1a911c SHA-256: ceaf8d46f52e02e0e90a1122fcca9469c17f3d73fcb6fbb22c15a00ef4b744fa
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document functions as a link farm, presenting a lure related to 'Bell s palsy exercises pdf' to encourage clicks. The embedded links, such as 'https://crophysi.ru/award?keyword=bell+s+palsy+exercises+pdf', are identified as malicious redirectors or part of a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/award?keyword=bell+s+palsy+exercises+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4493227/normal_5ff542fc653e9.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/p0iiChj/baby_care_playpen.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/QohhjiR/browser_video_downloader_online.pdfIn PDF document text
    • http://copyrighthelpptteam.com/hitachi_ultravision_tv_not_turning_on021i4.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/ehchjtF/xudobu.pdfIn PDF document text
    • http://agentsecure.space/cyberpunk_2077_ps4_gameplay_leak_videom28g8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_601ae1b524340.pdfIn PDF document text
    • http://extrameets.fun/will_amazon_release_the_expanse_season_4_on_dvdge97f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470387/normal_5fe001dcc392c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_6030a7956511f.pdfIn PDF document text
    • https://cdn.sqhk.co/ratugetaj/jcxicwW/tipareta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_60048da5d60ae.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/w7ifJic/lizexo.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/resabomibogodaw/64422761939.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_fa538c380826424796bdb3f9fa61fdbe.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_b568b0ef7b1647648dd99725ef7a9265.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posufij/naluwiwanizutozazawixak.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_e6bbd569bba74e36a67f07e5da174b82.pdf?index=trueIn PDF document text
    • http://lidufaz.epizy.com/formacion_nodular_anecoica.pdfIn PDF document text
    • http://lusafawapinoxe.rf.gd/present_continuous_worksheet_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/twitter_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/mc_angel_comedy_free.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_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 5368 bytes
SHA-256: 275bfca61d91abef2d3dc8ddcb43b00aecb6eaf4135006c58ce11c02f66343da
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10396 bytes
SHA-256: 01a224dc285597d5451f10cd6d9dc465a6004e02131028db79d43dafbe3cea28

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