Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef883f80e804cd3…

MALICIOUS

PDF

96.4 KB Created: 2021-04-02 22:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45200756d08d3c6c7eab8b7ee49dddc SHA-1: 99a0c6bb28e6577b167635e6983df041f9928800 SHA-256: 1ef883f80e804cd3262c89feac04f99414ed936384d6b8a82c210360da6318ca
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of an external URI pointing to a suspicious domain, coupled with a 'download button' heuristic, suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to facilitate malicious downloads or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/award?keyword=basket+strainer+pdf
    • http://xilatotes.sportsontheweb.net/524087646.pdf
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5fff6bbea7789.pdf
    • https://cdn-cms.f-static.net/uploads/4382948/normal_600b670b1f3b2.pdf
    • https://cdn-cms.f-static.net/uploads/4455406/normal_6054815d196f4.pdf
    • https://static.s123-cdn-static.com/uploads/4383314/normal_5ff669273d98c.pdf
    • http://sesizuxewewax.mygamesonline.org/is_walmart_having_a_black_friday_sale_tomorrow.pdf
    • https://cdn-cms.f-static.net/uploads/4474457/normal_5fdc5539633b4.pdf
    • http://pivolirarorip.mypressonline.com/does_dbt_therapy_work.pdf
    • http://vibusuroku.iblogger.org/biredemezomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nakevoja/xanitopetogiveriguvi.pdf
    • http://kopixagelaje.rf.gd/desijojazomolikufedaxinu.pdf
    • https://s3.amazonaws.com/bepukuba/77245648428.pdf
    • http://tefetuzuzip.myartsonline.com/97488222074.pdf
    • https://uploads.strikinglycdn.com/files/eb4a95f2-4f7e-48a6-bf35-ef9c94c14a27/44106328355.pdf
    • https://uploads.strikinglycdn.com/files/4dc10c11-2046-420a-a061-53582576cde9/how_do_i_know_what_size_windshield_wipers_to_get.pdf
    • https://uploads.strikinglycdn.com/files/b5cc8be5-80c2-4a9b-9c5d-7fc66973dd07/google_maps_find_my_home.pdf
    • https://s3.amazonaws.com/varolexexus/figurative_language_examples_sentences_alliteration.pdf
    • https://s3.amazonaws.com/zazelujeju/sizedulavugolisojor.pdf
    • https://s3.amazonaws.com/xowasosuf/pressure_points_free.pdf
    • http://lanosebezazov.onlinewebshop.net/strategic_partnership_agreement.pdf
    • http://kefedexopekose.rf.gd/88080134202.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_off00013cd0.bin
ccf39d4b6d66090e00c24dbed304a01cf89d727a91379fe9efb495117a4a6c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD0 5116 bytes
font_01_sfnt_off00014e4b.bin
8f85e5efd0859169bc719f7c5409f391fa86d26a3b7e3b0b367f3fb527414cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4B 11260 bytes

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