Malicious PDF — malware analysis report

Static analysis result for SHA-256 09281851da91f7f4…

MALICIOUS

PDF

88.8 KB Created: 2021-02-21 13:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e26e853e6e3a3ddc12e907aa1867b382 SHA-1: cd2804c13dc0f92592518db11221039f4367f9f1 SHA-256: 09281851da91f7f458a9ff805f4463dfa5ab12011dcce2f57aa950fafcf4434b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to distributing further malware or phishing content. The document's structure and numerous external links point towards a tactic of overwhelming the user with options or disguising malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://bologen.ru/aws?utm_term=on+the+genealogy+of+morals+pdf+download PDF link annotation
    • https://jegobegopij.weebly.com/uploads/1/3/1/8/131871729/7634553.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/jgii2ge/ted_bundy_cave_coordinates.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/f03ddba54.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/lelitebanerebosifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488336/normal_5ff0332a5fea4.pdfIn PDF document text
    • http://gigazukiwizave.22web.org/assamese_new_video_songs_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/lexujowina/a1mThh8/fegikabazikixeluzoxutunu.pdfIn PDF document text
    • https://petodudugagakot.weebly.com/uploads/1/3/4/6/134640630/mijixudinadifixem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_6027d7b2460f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_5fdb98b221ec0.pdfIn PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/3974d0752.pdfIn PDF document text
    • http://naworigexoz.iblogger.org/abscess_formation_pathology_outline.pdfIn PDF document text
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/jogujafikevovelegave.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/OheheVV/89624654071.pdfIn PDF document text
    • https://lanutitokoxoziv.weebly.com/uploads/1/3/4/0/134096970/kakidinaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_603221fad2479.pdfIn PDF document text
    • https://dovomarolod.weebly.com/uploads/1/3/0/9/130969455/pofudivisizedug-febujob-fotusameke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwurivetib.epizy.com/1_cm_graph_paper.pdfIn PDF document text
    • http://kukatunudivolu.epizy.com/migeb.pdfIn PDF document text
    • http://bazevogef.epizy.com/weritezaxigeges.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_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 5676 bytes
SHA-256: eea78f133fd1dcbb54f9826f4e8491393da63a49befeb00bf4c9ac53a3fb7cdf
font_01_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 12432 bytes
SHA-256: 092e8c873365d76cfdb8f7f3414600b8b06c701c333ec643d5ca0a20f95c5a86