Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef9b84553f1e54c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-06 10:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b6bda6ffdc8b4c0728967bb12ffa23b5 SHA-1: dcb3bb8e1aa1f979df532bc54d7ae7dad8281b5e SHA-256: 0ef9b84553f1e54c5c6c3389db622ae081f43256f6afcef7274d5a666cf2ea4e
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 0.9996

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://jottigo.ru/wix?keyword=monsters+university+full+movie+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fc96b5b85b22.pdfIn PDF document text
    • http://sisamow.iblogger.org/43301531536.pdfIn PDF document text
    • http://xenotobewaf.22web.org/tds_tcs_tax_challan_form_280.pdfIn PDF document text
    • http://figukamib.22web.org/what_is_burger_king_nuggets_made_of.pdfIn PDF document text
    • http://bifugejif.22web.org/zukatunexaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5fd7b58da585f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_602fdfb6f1226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potovoz.rf.gd/mainstays_black_metal_futon_frame_instructions.pdfIn PDF document text
    • https://2a4906e6-03f2-470c-9916-ffef438a4106.filesusr.com/ugd/94e5ef_5b30bacd98364d56ba5627e362cfb077.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_c9e83dfd1c4c4fb59c39a11345f2a14e.pdf?index=trueIn PDF document text
    • https://31e4cf53-1011-4add-8010-1ee96a99a80b.filesusr.com/ugd/6846fe_a78be3fb6b7a4b76bf3c38b504b375d4.pdf?index=trueIn PDF document text
    • http://retejepak.epizy.com/why_is_my_outdoor_sensor_light_not_working.pdfIn PDF document text
    • http://wazuvit.rf.gd/taxewekexurikizugedogej.pdfIn PDF document text
    • http://walefofu.rf.gd/err_cleartext_not_permitted_ionic_4_android.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_bf9f946f0ecc43e28c9608f4f0733078.pdf?index=trueIn PDF document text
    • http://komewubot.epizy.com/the_art_of_living_book_by_wilferd_peterson.pdfIn PDF document text
    • http://tuzoxizusuzu.epizy.com/sezexejavelipelofenam.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_f4949765d8dd44df811995e6ec81eaa7.pdf?index=trueIn PDF document text
    • http://guradewididexep.epizy.com/sawogidodoxavepovisufamoz.pdfIn PDF document text
    • http://vegexiwijije.rf.gd/skyrim_mod_list_nexus.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/arabic_alphabet_worksheets_tracing.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/zuxezirikiberuborixib.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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 5312 bytes
SHA-256: 34d84e81adb1e016df2220964502db9b90d39f136bfa93d2fc8ed3b4c139f7ea
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10332 bytes
SHA-256: b8ed64eac6d78b61510f9a6a5de76f05098ea1fc8680aef76af79ac7f9906695

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