Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae557877a14855c…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 06:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e416ca5f6feeea9856a1f9ab457dddeb SHA-1: 1a7c6b59108e157aaacbeab0d880b906b92a80dc SHA-256: fae557877a14855c18c572d0992b2a63d5aae905dc23d51d09d01fd8032b7359
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=sodium+dodecyl+sulfate+sds+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_60149efc92c92.pdfIn PDF document text
    • http://joy-todays.online/tawavifizlmrfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fcb03c82e6d9.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/miganijesunag.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/administracao_publica_comparada.pdfIn PDF document text
    • http://malespw.xyz/how_to_add_music_to_my_eclipse_mp3_playerj9yjh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_60451f11559a6.pdfIn PDF document text
    • http://pankreatitum.ru/how_do_you_reverse_google_search_a_picturetjt3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417815/normal_600626059a4d6.pdfIn PDF document text
    • http://jakebaxujimug.22web.org/vawaritabu.pdfIn PDF document text
    • http://teleporttur.ru/28619946513bipqh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fd282d85e838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_fbddca546b6943f5bab765a30f0de85a.pdf?index=trueIn PDF document text
    • http://gotuziput.epizy.com/approval_sheet_meaning_in_thesis.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_07438ae2467643358bc5e2fe667193a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/new_malaria_treatment_guidelines_in_tanzania.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/south_africa_drinking_water_guidelines.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_6fdb4b9d91984a0f97b9ea8b5932c437.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bivanud/chick_fil_a_team_member_apparel.pdfIn PDF document text
    • http://kujujigufa.epizy.com/rigimirokav.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_df4e4548b2e2450d8cde97a602f98526.pdf?index=trueIn PDF document text
    • http://goguvero.epizy.com/diary_of_a_wimpy_kid_long_haul_rodrick_gets_shot.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_f2702bcb305544b7bd04f0ec1826d32a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5408 bytes
SHA-256: a990ea0c64f595ecc3bd54850d9e9152f8203a3f78aebef76552f3a6736ea4f8
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 10420 bytes
SHA-256: 82da29f3ae91e0dc3de845b578a2ccb2efaf52fbfa2c07eb283f4db70f7c6936