Malicious PDF — malware analysis report

Static analysis result for SHA-256 699433f9f6819c73…

MALICIOUS

PDF

115.3 KB Created: 2021-04-16 03:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b152c44a2eed7cb004d361f60096f6b SHA-1: 4d1d77089063aae16edec42a66a8c256561a5980 SHA-256: 699433f9f6819c73c1ad479e0cde3d963ae70707fa4d3bcd61fc48841bad05cf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://xezojetit.ru/strik?utm_term=descargar+musica+gratis+de+frankie+ruiz+tu+con+el
    • http://babubusawase.22web.org/bobimumujokubob.pdf
    • http://rexevivejegox.scienceontheweb.net/zimubud.pdf
    • http://bodipok.getenjoyment.net/juvofer.pdf
    • http://mapumuvovabukux.22web.org/page_break_inside_avoid_wkhtmltopdf.pdf
    • https://nolomiwasuwizug.weebly.com/uploads/1/3/4/6/134661688/b019717fd58d0.pdf
    • http://bikokobolo.sportsontheweb.net/24812576874.pdf
    • http://jawazapefaxuzit.mywebcommunity.org/past_simple_regular_verbs_games.pdf
    • http://rafupufubed.mypressonline.com/68129530192.pdf
    • https://didonomomosizol.weebly.com/uploads/1/3/4/8/134892758/8b1dc495b9c8.pdf
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/kuxinibunowinejan.pdf
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/223b7fa27a95df9.pdf
    • https://cdn-cms.f-static.net/uploads/4379491/normal_600ce9e640b50.pdf
    • http://revodegasiger.sportsontheweb.net/rawode.pdf
    • https://cdn-cms.f-static.net/uploads/4393356/normal_603dad89dc0bc.pdf
    • https://wadagoxegoti.weebly.com/uploads/1/3/4/3/134385229/muxisizizexa_wijoxodururolob_pepagamoxasi.pdf
    • https://cdn-cms.f-static.net/uploads/4491686/normal_606b6bbb5f273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_4686a3a79f9e424187d3effad724ee9f.pdf?index=true
    • http://sanugifop.atwebpages.com/lean_software_development_an_agile_toolkit_poppendieck.pdf
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_132f24a9bd9141c9920a0b8056d45e1f.pdf?index=true
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_c8db7fb2c5004455b6234a63534ef10c.pdf?index=true
    • http://fimamuvumurepu.rf.gd/12807520450.pdf
    • http://vibiruguwotugo.rf.gd/wategabuduwuwavuwiparig.pdf
    • http://muxuzuvom.epizy.com/1324053516.pdf
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b93.bin
edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B93 6440 bytes
font_01_sfnt_off00016b89.bin
791fb3dedd20bab5a999c907e526aeceb262a60afe05de5f4adfcdddde5786d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B89 5452 bytes
font_02_sfnt_off00017e11.bin
0d05869bb8f0dcacbaa1866a8e60cea71ef5a958a842e1961590acb8af7856b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E11 12100 bytes
font_03_sfnt_off0001a5b4.bin
f04cf64b8ea46773afeb3bd377bc4d70560f6f66217e6dc3360c34c72c2c715c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5B4 16944 bytes

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