Malicious PDF — malware analysis report

Static analysis result for SHA-256 f724a0a979cf5f62…

MALICIOUS

PDF

86.0 KB Created: 2021-03-03 05:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aeeb5e4b1909f9c2d9efa6457191ab54 SHA-1: 1817930ae88cb57b47c1445a1884f8ab8e5ef1a8 SHA-256: f724a0a979cf5f62cbd7d2cca87de7590513ccfc110c29d628a5e7a05613fdfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The primary lure appears to be academic textbooks, with one URL specifically mentioning 'medical microbiology and immunology textbook pdf'. The presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=medical+microbiology+and+immunology+textbook+pdf PDF link annotation
    • http://madewithsunshine.com/realistic_3d_model_planet_mercury1i8q7.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/dajudugiri.pdfIn PDF document text
    • http://hydrofthol.space/wordpress_login_redirect_to_old_domain5gbph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_60312f1779e96.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/nwn_ravenloft_module.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/ujjsSbO/89318585187.pdfIn PDF document text
    • http://liolika-rsya.ru/woked2vxn4.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/520d8Q5/real_fast_followers_likes_comments_for_instagram_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444856/normal_5fe16392e958b.pdfIn PDF document text
    • https://mewabasotu.weebly.com/uploads/1/3/5/3/135312567/fufozalozi_jejadixosir.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/logurezevakimidopufon.pdfIn PDF document text
    • http://luminar4-download.xyz/oklahoma_cdl_practice_testxtud3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_60335d26e2913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_6017ba5551a3d.pdfIn PDF document text
    • https://latebutaweba.weebly.com/uploads/1/3/4/3/134315799/8167676.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/gii0jav/98961744403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_600e4c8f872f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5fc9c4356e992.pdfIn PDF document text
    • https://xuvevajepew.weebly.com/uploads/1/3/0/7/130739459/gakarizinusexam.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/xinafadavokiji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 5320 bytes
SHA-256: f3ab5f577087912e87df95e1d9f38f4a4b055e5779455fbb9391e56556a405cd
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 5676 bytes
SHA-256: e65c1848e0390e0c49ea0c4e0a18897c4f31960504c0b463a373be6f3fd392e7
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 14900 bytes
SHA-256: 4006d28e93c7e8348aee8cc22e63166afe9044ffd1ad8d33e3e5c6698d24e158

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