Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c8ed255180c75a…

MALICIOUS

PDF

85.7 KB Created: 2021-05-20 04:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 91055799c1ae7799aff91f16db253242 SHA-1: be963fa9693b0c72c07e30a2790527b5f8a922a9 SHA-256: 12c8ed255180c75a78f9fb151dd8c17fd7492c99d0f8d26a4bc69f51ea9ed37b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 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://golowaki.ru/strik?utm_term=advanced+calculus+explored+hamza+pdf+free+download PDF link annotation
    • https://xulexina.weebly.com/uploads/1/3/1/3/131398260/mojibuxodivipepiban.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/nebuv-kugejomuvakafel.pdfIn PDF document text
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/gewapimarap-buvobisipotuto-rotepate.pdfIn PDF document text
    • https://wuselusovofose.weebly.com/uploads/1/3/1/1/131164562/a13031e550b13b5.pdfIn PDF document text
    • https://jaxanotev.weebly.com/uploads/1/3/1/1/131164383/5870117.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/8867518.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/7130735.pdfIn PDF document text
    • https://tovibimatajo.weebly.com/uploads/1/3/5/9/135963052/zivoxafigoteve-sijowupe.pdfIn PDF document text
    • https://foxidaxoluw.weebly.com/uploads/1/3/4/0/134016742/taxufuvuvijix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/ata_guidelines_for_papillary_thyroid_carcinoma.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/telugu_movies_arjun_reddy_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca554db-891c-4f0b-bb1d-efd083704db1/how_to_use_a_drill_black_and_decker.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/17390437668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60577b13-1d50-4b65-a02c-2f98ad067d14/golf_buddy_voice_x_vs_voice_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/46307642392.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/tinevasunogiditugiveje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62392e56-b453-4fd2-a34f-f78fd7aa1eaf/sozipujiwominu.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/chief_information_officer_salary_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/ti_84_plus_ce_software_update.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/acids_and_bases_worksheet_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/zikibazubidid.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/how_much_is_roomba_i8_at_costco.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/elder_scrolls_book_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/how_to_connect_hp_deskjet_2542_to_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28c8b1c-481d-422b-a9c0-cb48e86b3eba/what_is_the_best_beginner_strength_program.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 4372 bytes
SHA-256: a16e8047230f6ebfdd00f3a30acf7bc43c260efb069485d821ea9a857486f582
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 5656 bytes
SHA-256: 77bfd16e221f09b41f83662646c060e3d0582d6f269e55cd549423177b951e6c
font_02_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 2012 bytes
SHA-256: 79cd5a5858aeae4c0704f59666bebf172392ab72eacde038cf8a2ee3c8b36e2d
font_03_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 11172 bytes
SHA-256: 85d17267bc03bd2a3a2867f0a5322965dd0661e54fbb42fdff4625f64f036cc4