Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaa9c6495e0d830…

MALICIOUS

PDF

75.3 KB Created: 2021-03-11 09:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 838915704167d08733bbd5169b15de08 SHA-1: a5abc60da37385b11c2b3611f6c94a9b3618a400 SHA-256: 7eaa9c6495e0d8304d8caaeb4d7012d25d3adcce4e0575c8c01d53ebe9a355be
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as part of a link farm on disposable hosting. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/award?keyword=archicad+19+tutorial+pdf+download In PDF document text
    • http://com-signto6.xyz/892437662535ns8i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_5fc7d40d72ea1.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/haZhehd/turisaxijulonusu.pdfIn PDF document text
    • http://copyrightprivacy.site/how_to_know_if_your_water_heater_is_leaking_gaskcftr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5ff1054b5bd85.pdfIn PDF document text
    • http://instapriz365.site/facebook_ads_template_excel5jzhn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_601b19258f4cb.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/ljchcgg/21516948058.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/LiaPWic/ninja_sushi_arlington_texas_price.pdfIn PDF document text
    • http://fdvsefwfrw.space/the_end_of_the_f_world_comic_read_onlineyydmo.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/k3ghjjv/damogewimamomegit.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/IPiabjb/zigzag_line_artwork.pdfIn PDF document text
    • http://repetitor-ru.ru/8546558118qhnu6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_6e980c9d612842acb2289271bc931c7e.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_381b8916a6ad4971a853819664a3ca4f.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_fc64ec37905d4b32a3592b6e1ac4b452.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_6342051f395e442a9e41bfd34fdf3173.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_8f1ae2838dbc4fe183e486589eb20024.pdf?index=trueIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_69f5a9ad84fc460cb1a85543b8771059.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_9f79037407cf45bbac76313a910d4b91.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_7d76e3ceda7246209ae7667d5ae85204.pdf?index=trueIn 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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5352 bytes
SHA-256: 9518da6e12bb4432323cbe5b545880739becacf20cef29e83be9395eccdfea5b
font_01_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 10464 bytes
SHA-256: 580a999431ca91a57de46c280008f38e8be3c4729afddfccfc857f358f414ee9