Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef43e3628a4c33cd…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 18:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c95c2d5e6d29874c992d1541a8d5e26 SHA-1: dcbd39907065d5e563d9b7c28865000d7201e08f SHA-256: ef43e3628a4c33cd214cfbcea505e9ebe71666952f8338fb0b8ec74bf8a9246c
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=carbohydrates+fermentation+test+pdf
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5fef8cf0d8381.pdf
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/2aa56894c.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6009e448c9521.pdf
    • http://rorixuge.iblogger.org/96095770473.pdf
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/gumijenibidudak.pdf
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/memajut.pdf
    • https://cdn-cms.f-static.net/uploads/4367303/normal_601727330868e.pdf
    • http://devajusogav.22web.org/revukovowosebubujuruwa.pdf
    • https://cdn-cms.f-static.net/uploads/4366337/normal_604135001ce6a.pdf
    • http://bufenukaje.22web.org/vocabulary_in_use_test.pdf
    • https://static.s123-cdn-static.com/uploads/4422914/normal_5feb9d341d268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xomepixo/d_s_l_r_ki_full_form.pdf
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_8bd1b3887a2b4dce84fb7a7dba0b4993.pdf?index=true
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_544bb7f4f68d4b898b9ea0e603d23b2e.pdf?index=true
    • http://dekifovep.epizy.com/bajirao_mastani_full_movie_yify.pdf
    • http://bekusisit.atwebpages.com/manual_bambuterapia.pdf
    • http://pilejifizodan.onlinewebshop.net/27134843238.pdf
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_c389db5e3cf744d39bad1da7899d3376.pdf?index=true
    • http://vumamuv.myartsonline.com/wivabulam.pdf
    • https://s3.amazonaws.com/ziwuvijevo/97923682232.pdf
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_e2f098f1523f447db1211c1c9a34a633.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40c.bin
e4394943ba9f4bfc3e126a583c374872ec15f6b681de0ee4dfd60c150824c258		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 5304 bytes
font_01_sfnt_off0000f5f3.bin
ef3e97e05f0e3fc880f18fa6ef23fe609d2cfcc5b44b8b320a9292abd1d1e3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 10852 bytes
font_02_sfnt_off00011b0f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 4324 bytes

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