Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fff21685f08800…

MALICIOUS

PDF

77.0 KB Created: 2021-05-26 02:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1717a571a23045c75150fa0b4c1598fa SHA-1: 602aa920033e835cdcd1527e8bd2817c10b0dc73 SHA-256: 08fff21685f08800a232e405b86f076505439662d1cac0776c329c0106592af9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. While the document body is heavily obfuscated, the presence of numerous external links suggests a link farm or redirection strategy. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cdn-cms.f-static.net/uploads/4389097/normal_605aa73bc5037.pdf In PDF document text
    • https://vazaratel.weebly.com/uploads/1/3/4/0/134017227/68912ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fe30bf7b7384.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/bedize_sozesilogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_606035cd91eb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5fed52e64a7e4.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/7bc1f0943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_6035ba207095c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_600396633ce86.pdfIn PDF document text
    • https://suxeredevi.weebly.com/uploads/1/3/4/0/134000194/fopid_nanogalas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_602053fc922cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_606dfb2b96aa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_600a7a88458c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=best%20free%20star%20map%20app%20for%20androidPDF link annotation
    • https://uploads.strikinglycdn.com/files/bf85a549-c9b8-4db0-ad4f-06282c52f9fa/julopazegapureso.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/14057784846.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/admin_login_form_using_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/definicion_y_caracteristicas_de_texto_argumentativo.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/reliable_sources_for_research_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/xanonamadeforetuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/bully_lite_v4_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cf48a8-0ff0-4fa5-9e4b-193e68efed41/kulexabelobododeraxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800b856a-3451-49e9-8683-edb1eba9258a/45901558391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008bae4c-d9ea-4977-bfc4-4f338c8c84e3/hoover_power_scrub_spinscrub_50_carpet_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e5dbfb-b839-44af-8e5f-4358157ca60b/what_is_factor_of_safety_in_engineering_design.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/34405311294.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/19579149189.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/pressure_ulcer_icd_10_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/how_do_spell_spiritually.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5204 bytes
SHA-256: d9de508368eae2c9cdbd716972b3d46e926bae6fdf8850c94bab978b0ad78557
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 11036 bytes
SHA-256: 0b7a8f6044e03d8596c85724c42725b9fd08a65725a7fd33d71eef88bf967893