Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c31d54b7aba7ec…

MALICIOUS

PDF

150.2 KB Created: 2021-06-07 09:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 470024c519843e9aad06deecc66bab0d SHA-1: c3a1f0b4d4c5e57ec769a6f24d477e1a08dd696b SHA-256: c4c31d54b7aba7ec4f428925b33caecca8ec991b3b62e7b48f6408204d315e9d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics further supports a pattern of directing users to potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/pbw?utm_term=lady+gaga+singing+shallow+at+table+read PDF link annotation
    • https://jasuxazej.weebly.com/uploads/1/3/4/8/134875243/3369062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_6048fc2e928e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365657/normal_5ffc384cd7805.pdfIn PDF document text
    • https://gerulelib.weebly.com/uploads/1/3/0/9/130969354/burujosetidu.pdfIn PDF document text
    • https://wepesinojaru.weebly.com/uploads/1/3/2/3/132303052/nilodetodi-wedim-supamup-fanijoxuritade.pdfIn PDF document text
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/lizoromijakunopogag.pdfIn PDF document text
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/fanalil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_604cff4e6885c.pdfIn PDF document text
    • https://nipapisowoxodo.weebly.com/uploads/1/3/5/3/135349464/9855436.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/1488967.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/fukuw_posokidixavawuv_puzekimefom_jumawil.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/6b7b9f137f383.pdfIn PDF document text
    • https://lokawerimi.weebly.com/uploads/1/3/0/7/130776865/6872197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450048/normal_5ff9681045396.pdfIn PDF document text
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/zepobikefazuf-jebogirutivover-kikigubapin-bitupomadimo.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/nixiratexix-vowidal-ninalodif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_6019201f1ce71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_6032d488dda62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_605f280cda215.pdfIn PDF document text
    • https://vomomojivebaju.weebly.com/uploads/1/3/4/5/134599032/3127176.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000224b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x224B2 20664 bytes
SHA-256: 549c54671a6110e3880da03c197328ab953ab637f8d198fe63db36908f111aac
font_00_sfnt_off0001bdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDDA 5364 bytes
SHA-256: d9164564eb9887e81ceb2ca2cebd1c4c55748b09e7740ac1f5e117dfbaf0434a
font_01_sfnt_off0001d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D021 6320 bytes
SHA-256: 01c3d6a0e615d8bec1fc7d534eabecdc14f1d8488cccada92db051f6094a26e6
font_02_sfnt_off0001e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E40F 2012 bytes
SHA-256: c744a51b48d596f672cd233ead2463e7bb698a55b355cdb5fdf8ef887681b55c
font_03_sfnt_off0001ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED45 19088 bytes
SHA-256: 02751ac7206aea22fba446c814dd554577762643185b059d3b3883fb6809f0d5