Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3f3d869d711ad1…

MALICIOUS

PDF

78.7 KB Created: 2021-04-03 04:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 020fd0cbb51b35b69397f4ed12c6837e SHA-1: 8bc77cd2c042112e8d28f973f89dfba742ad25f8 SHA-256: ea3f3d869d711ad14529bdae9a6920dcbae74a22dcfdd9e0a3830cb0eacc3e89
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://pelibifir.ru/wix?keyword=nakamichi+headphones+review
    • https://tazavujaxiruvo.weebly.com/uploads/1/3/4/7/134746990/gufibavarox.pdf
    • https://bisobozewex.weebly.com/uploads/1/3/0/9/130969373/c2dede08c2.pdf
    • https://mozesejute.weebly.com/uploads/1/3/1/3/131380505/robaroje.pdf
    • https://cdn.sqhk.co/rorajakura/ibqhhvD/my_friend_birthday_party_essay_for_class_2.pdf
    • http://shoppingyxplus.xyz/oto_navigasyon_program_indirbmpfy.pdf
    • https://cdn.sqhk.co/kotoweraga/Ggfgdge/12713666156.pdf
    • http://about-igsupport.com/23787350645rjcoz.pdf
    • https://guxosenenizezov.weebly.com/uploads/1/3/4/5/134598055/71293.pdf
    • http://circulyarkadigital.xyz/los_pronombres_relativos_ejemplos51rtu.pdf
    • https://risegutu.weebly.com/uploads/1/3/4/2/134265716/6748809.pdf
    • http://zeropium.com/guitar_fretboard_notes_wallpapers0gl7.pdf
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/retosozigigovixunu.pdf
    • https://cdn.sqhk.co/nijalemivowo/iijehgd/90653614315.pdf
    • https://cdn.sqhk.co/vujenibolo/NWgfght/alchemy_gold_making_guide_classic.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/350561f0-4274-439a-9ada-f4cde067d0b2/36557904389.pdf
    • https://uploads.strikinglycdn.com/files/a0bdc042-cbc7-4e89-9593-cd7bb525b5a3/91177802022.pdf
    • https://uploads.strikinglycdn.com/files/64749c5e-6b38-49ed-a66e-c58fd128dc4a/minecraft_wii_u_release_date.pdf
    • https://s3.amazonaws.com/bakoloj/onclick_submit_form_javascript.pdf
    • https://s3.amazonaws.com/wixanarer/kayarian_ng_pang_uri_worksheets_grade_5.pdf
    • https://uploads.strikinglycdn.com/files/0b182f3c-e09f-4ee9-8ba5-643160bfcacd/how_much_oil_does_a_briggs_and_stratton_450_series_take.pdf
    • https://uploads.strikinglycdn.com/files/e1630799-9813-4dc7-9942-54d3cc868931/adobe_indesign_tutorial_book_layout.pdf
    • 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_off0000f619.bin
7eeb67dca5faca465d6af53cbe08b660632254b869a7615d000c86c4ff6de906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 5464 bytes
font_01_sfnt_off0001089e.bin
6c4a6b4b848cdc82caf3260f1bb6cd24bdcd85820e151d4852d25cae8d2f00e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 10796 bytes

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