Malicious PDF — malware analysis report

Static analysis result for SHA-256 895f8d77bb087732…

MALICIOUS

PDF

71.8 KB Created: 2021-04-01 10:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa6ed2e6db349351fd824885d9503406 SHA-1: d92a696c393cd66df3f24a1858f4e21e2bfd3745 SHA-256: 895f8d77bb087732224240b785250f741df0dc430b0edfce2eb64079b2d07ac4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic. The primary URL, https://dafemum.ru/strik?utm_term=bless+me+ultima+quotes+chapter+13, suggests a potential phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://dafemum.ru/strik?utm_term=bless+me+ultima+quotes+chapter+13
    • http://gixuloponij.mygamesonline.org/6198888170.pdf
    • https://cdn-cms.f-static.net/uploads/4496853/normal_602073021af68.pdf
    • https://tegedibinatamam.weebly.com/uploads/1/3/5/3/135350324/zojeveliwukufex.pdf
    • https://xotizirew.weebly.com/uploads/1/3/1/8/131855992/talekiwut.pdf
    • https://cdn-cms.f-static.net/uploads/4381094/normal_603d553e90626.pdf
    • http://dololebajug.scienceontheweb.net/changing_file_to_word_document_free.pdf
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fe42181101bc.pdf
    • https://debivozujorebol.weebly.com/uploads/1/3/0/8/130813616/9310354.pdf
    • http://naliputa.mywebcommunity.org/3d_exporter_for_autodesk_autocad.pdf
    • https://xadafujivesa.weebly.com/uploads/1/3/1/3/131397927/jelefusizuferuxola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9d188246-a2d9-419c-b481-350ea9ffcb0f/73405987582.pdf
    • https://uploads.strikinglycdn.com/files/248bbe97-5324-444b-bdbc-b7a032406e3a/will_there_be_another_the_5th_wave_movie.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_fe3caba2b87b4283bc8bf654a31bcd51.pdf?index=true
    • http://mewabetowa.myartsonline.com/boiled_egg_diet_plan.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/distinguish_between_a_virus_bacteria_and_fungi.pdf
    • https://s3.amazonaws.com/wolina/myers_psychology_for_ap_3rd_edition_slader.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_8ab8007eed3443f49ce1a8c0a272e8a6.pdf?index=true
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_cb975c04133b457a9e8ea70b7fc7ca4b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/181d2f84-1653-43f2-bb03-9bd5df98f4ad/59575508045.pdf
    • https://s3.amazonaws.com/pibabopuduj/giorno_s_theme_piano_sheet_music_musescore.pdf
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_ae799ce9f7ef493da41a3b1cf54bfc3c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad5.bin
08511597c0c478da4ec233ce973c581d75cfb280d5d5cc46a2c3c95fe286804a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 5564 bytes
font_01_sfnt_off0000ed9d.bin
a756550034bc90f92cadc6297b225d6e8302416789a0a6f063786ab7044fd24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 10404 bytes

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