Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e475399f4ccca9…

MALICIOUS

PDF

86.0 KB Created: 2021-04-10 00:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ffba195a1c1f2039eb98c61bc52dc06 SHA-1: 90c635fcd222ff4388d2dd795a4fc7ce93b0aeb3 SHA-256: 87e475399f4ccca97e4581d67acf756cfd49b85172768ecfbd861cdbb47098cb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a prominent one leading to 'fokemale.ru'. The document body, though partially garbled, suggests a lure related to the 'rising sun flag' to entice clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=why+is+the+rising+sun+flag+offensive PDF link annotation
    • https://cdn.sqhk.co/lenubire/djbjqDT/wemazaxuvutopefeban.pdfIn PDF document text
    • http://mpvideo.org/44128663584m1djc.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/gWgdrhe/keromujumibuxudad.pdfIn PDF document text
    • http://avit0.cc/khan_academy_sat_practice_test_6_scoringhb63i.pdfIn PDF document text
    • http://cashbackk.site/java_1._8._0_181zyxya.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/kowaganodifajitukowaluhdjbu.pdfIn PDF document text
    • http://zabavnyi-slon.ru/effective_phrases_for_performance_appraisals_james_nealfyypc.pdfIn PDF document text
    • http://damvglaz6.xyz/pablo_alboran_discografiaw0swb.pdfIn PDF document text
    • https://cdn.sqhk.co/sixomapugep/mK06wvn/99_allah_names_with_english_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/jgcJgiQ/monster_arrow_fighter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/79558380105.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_ae1d1e7944ae4f249e15419ff81ac10f.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_492a9184a9b34350bf822a767f25e4fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/50185405366.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/29437994845.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_388471075cd74411a69e6b8b89562900.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/sainsbury_s_plain_bagel_nutrition_information.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_1520dcb9c7b748d1836f8a2ef5e93dc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/11578871899.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_8bd35431bf0d4b91948bcf919b979a2c.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_351c121bde4e4022ac064e802531207f.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_251a15697fe54673bb8e35c17a66460a.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 5204 bytes
SHA-256: 5102126ce227bc1f5f2947d8767c7795735c26b00bdcc4477d952aa9ae01b57e
font_01_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 11236 bytes
SHA-256: d018e4581f97b3cf1f7a06c610267795d8e06475a91c14286afe4e876a2a259f
font_02_sfnt_off0001352b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352B 16076 bytes
SHA-256: d14a31a02ce1c4152bb15d5126a0dec4416b44fa6c82943fd1949f8858d11b01