Malicious PDF — malware analysis report

Static analysis result for SHA-256 154a85cd6c605973…

MALICIOUS

PDF

85.3 KB Created: 2021-03-24 10:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a672da26e095cab140507f1c0dd81552 SHA-1: 7652fc672f99803305832b81d852664518863093 SHA-256: 154a85cd6c605973ad7ea03b2dd335126407041dce8548b2f968afa4f3aeac44
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, suggesting it is part of an SEO link farm or a phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a tactic of using seemingly legitimate document content to mask malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=cheek+cell+dna+extraction+lab+report+conclusion
    • https://cdn.sqhk.co/waxobakal/banBKja/pubopitovajeriterebu.pdf
    • https://cdn.sqhk.co/naluloli/gOuXVer/kundli_maker_app_for_android.pdf
    • http://dapurixid.sportsontheweb.net/sikelavosega.pdf
    • https://cdn.sqhk.co/kefivaxepaj/phinhjd/bezozomikavemokovojel.pdf
    • http://beviluxenumiliv.mywebcommunity.org/standard_of_excellence_book_1_e_flat_alto_saxophone.pdf
    • https://cdn-cms.f-static.net/uploads/4479441/normal_601d67b51f849.pdf
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5fceced3826bd.pdf
    • https://cdn.sqhk.co/vujaderaz/hb6dxBt/10133610955.pdf
    • https://cdn.sqhk.co/rapovixovuti/iijmAja/20386853570.pdf
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fca3c7e12e8a.pdf
    • https://cdn.sqhk.co/xiwasazafu/XoTK1OR/movie_called_searching_netflix.pdf
    • https://cdn-cms.f-static.net/uploads/4374686/normal_600cab875e91f.pdf
    • https://cdn-cms.f-static.net/uploads/4391624/normal_602f9f4f8d004.pdf
    • https://cdn.sqhk.co/vamosopon/gjSjid6/cracker_barrel_near_me_menu_prices.pdf
    • https://static.s123-cdn-static.com/uploads/4369632/normal_5fd0420a7caac.pdf
    • https://cdn.sqhk.co/veleviziwew/UwWukK5/homeschooling_options_for_high_schoolers.pdf
    • http://zumewidife.mygamesonline.org/buggy_frame_design.pdf
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ff933fd45b7e.pdf
    • https://cdn-cms.f-static.net/uploads/4413475/normal_605886837d107.pdf
    • https://cdn.sqhk.co/vivepovugeli/HOjfYZt/z_nation_season_5_episode_2_review.pdf
    • http://borejukeluteva.mygamesonline.org/auxiliary_verbs_exercise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_dd3eb78303e14960968276727edbddd6.pdf?index=true
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_323ceb8f14e7426bad288cf70ced3975.pdf?index=true
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_ce40cca128834f25bb2fe5b62aabd648.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed61.bin
9452592479fc06fdf5a1509cc985473eac84f42206d49f3dbd1e671ef1c99553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 5340 bytes
font_01_sfnt_off0000ff6e.bin
635454b5a669a7a3882a41fe092deb21d79caeb755f8fa5ec4048daf769d1e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10804 bytes
font_02_sfnt_off0001247c.bin
1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 16140 bytes
font_03_sfnt_off00013978.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 4324 bytes

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