Malicious PDF — malware analysis report

Static analysis result for SHA-256 10403468b669b6be…

MALICIOUS

PDF

73.5 KB Created: 2021-03-07 04:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9e0475784389db668b7da966ccdbc3 SHA-1: 4891c59cc96609263633e5326d68972234daabd3 SHA-256: 10403468b669b6be9aa058193ab5f11e75e56bb0974f4315de14da3121c271cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to distribute malicious content or phish for information through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=lion+king+spokane+showtimes
    • https://cdn.sqhk.co/xuluriwu/3hdF5je/battleship_yamato_2199_wiki.pdf
    • https://cdn.sqhk.co/ximepadogi/Sgcgjhb/strategic_leadership_meaning_in_simple_words.pdf
    • http://wbigs.space/linksys_ea6400_manual_configurationmbago.pdf
    • http://detonic-deutschland.website/stickman_dash_ios3b6g6.pdf
    • https://cdn-cms.f-static.net/uploads/4454558/normal_6018e247758df.pdf
    • http://natikolom.site/mujujipis5oci.pdf
    • https://cdn-cms.f-static.net/uploads/4454821/normal_5fd2797884fce.pdf
    • https://cdn.sqhk.co/lerapuraroke/jdBBPja/greenlight_debit_card_for_kids_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6028a7aab2efc.pdf
    • http://shoppingyxplus.xyz/photoshop_creative_cloud_macgdt0k.pdf
    • https://cdn.sqhk.co/voxobidivel/jbs3iiC/lubefikujisekudowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kagedatabujo/kia_android_auto_app.pdf
    • https://s3.amazonaws.com/wefemabeni/adobe_illustrator_cs6_for_windows.pdf
    • https://s3.amazonaws.com/wurivuve/pujenemuromadogopujimefov.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_bbb512c6c4cb458995d7aec24fa13dce.pdf?index=true
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_88b6992307d74ea6bab6b6be6459839e.pdf?index=true
    • https://s3.amazonaws.com/sasufufa/today_s_jumble_answer_the_gazette.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_1561615ea1b646248984aad645fe88ab.pdf?index=true
    • https://s3.amazonaws.com/teximikamukubo/brinkmann_charcoal_grill_manual.pdf
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_bf363584af094a119dad0a1490111969.pdf?index=true
    • https://s3.amazonaws.com/petuzutemixuvod/79895455898.pdf
    • https://s3.amazonaws.com/mulerux/rilabawe.pdf
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_b0090089b4bb4531bcf774d6f10dd1df.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e378.bin
c72c18664ce3acbfc5fed3df5aa7e6deb0f0c600a8f0203331fb34fa7147443b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 5204 bytes
font_01_sfnt_off0000f52a.bin
929482782585f076d084eeb9b0bd709bea5a32bd594ec720fec711ceb85d05ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10580 bytes

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