Malicious PDF — malware analysis report

Static analysis result for SHA-256 553d82689504b3f9…

MALICIOUS

PDF

76.3 KB Created: 2021-04-08 01:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf12924a27bcb2bccd482e5f0c42cb47 SHA-1: 9bc0f4df5fbe31dd18b90739ab3fa7c263ce5b7c SHA-256: 553d82689504b3f95d29f05c7517912c01d3e69b515e2d9a42bcffb82aff4f69
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jumiwimov.ru/123?utm_term=instruction+manual+for+whirlpool+double+oven PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5feda35740a47.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/86945043010.pdfIn PDF document text
    • http://tenopokas.22web.org/85301729054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_605ab8316c6cf.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/nejufiwakokisemovet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_6007484469432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_601b52106df6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5fd8e8e00fd9c.pdfIn PDF document text
    • http://rogevunesopu.medianewsonline.com/bodybuilding_diet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_606e2526cf632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5feb215cd41f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_605ce0c30525f.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/1st_2nd_3rd_law_of_thermodynamics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_606359d590e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_602b227b361a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fe11679f28e1.pdfIn PDF document text
    • http://sosiwuro.iblogger.org/how_to_play_brawlhalla_cross_platform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_601232396055c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fda8932cf802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_604a803145792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5fc6936da1e1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugenizuridaj.atwebpages.com/the_bluest_eye_summary_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/akademia_pana_kleksa_nuty.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/tepamatarejiwunu.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/maguwapudedazidebumefope.pdfIn PDF document text
    • http://gojejamajutemus.epizy.com/gefovojezexofup.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 5624 bytes
SHA-256: 3f6dd9e1cd7b3750dc54b8ce688f37c94c39e14836f92215c97efa0d54771afb
font_01_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 10684 bytes
SHA-256: 2f9a6ec8e350e074882fb44cde01ca352b18cedb4f6a4c15e7aa5f7056f63eb4

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