Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd73aee6e8449f77…

MALICIOUS

PDF

89.4 KB Created: 2021-03-07 15:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 30cc5e71f27ab1420a96403759589527 SHA-1: f68fdb1d83115344c7c87e8de8aeddfe288bf039 SHA-256: bd73aee6e8449f777a3b25a37fc85b3f93eb7af4e843faff0b66270a8588750d
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites, one of which is disguised as a search result. The PDF contains a large number of embedded URIs, indicating a deliberate attempt to create a link farm for SEO or phishing purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wb?keyword=the%20crucible%20comprehension%20questions%20act%202 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475859/normal_5ff5bff69da33.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/c3c3ee1f.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/vunepepeto-bodosasituro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404745/normal_6024595a0f708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375207/normal_5ffa2eeef06aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_60172c3f2b19f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fcca1f4063f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_603b0b1e886d3.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/pifilu-favasi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5febce2f94895.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/bcd_to_gray_code_conversion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_b3ac40c3355745d88eccbcf44d2f090b.pdf?index=trueIn PDF document text
    • http://gomitobovuni.rf.gd/53112164839.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/21322207363.pdfIn PDF document text
    • http://nebopujewewap.rf.gd/call_app_on_phone.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_564995d8103b473ea719a0aaf8c41a5e.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_9b061bc49bf5425b982003dd6eaf0635.pdf?index=trueIn PDF document text
    • http://nararinakajufu.rf.gd/35925284253.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_dd1c7f71ff85490b89517436a0a73009.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_0a30f7430ba54a2189d81e29926708ae.pdf?index=trueIn PDF document text
    • http://bogibil.rf.gd/bangla_fonts_free.pdfIn PDF document text
    • http://fudojozijenabux.epizy.com/50946418591.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 5520 bytes
SHA-256: 67dc0991993b1977c145872323e8d0c1e456a6e6f55c6a6b701fe77550e19df5
font_02_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 11516 bytes
SHA-256: fcdfc02a7d4e5fb09b997558909066ac46e258a08648f58e93c19407d85bc4e3
font_03_sfnt_off000142a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A9 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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