Malicious PDF — malware analysis report

Static analysis result for SHA-256 143e74883782625b…

MALICIOUS

PDF

80.4 KB Created: 2021-04-04 03:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ac3292cd2fa084397842b44551ad1b9d SHA-1: 8ba73f40e51c5468269ee4c16a8ec9191fade6b9 SHA-256: 143e74883782625ba7f3a3d9dfd122fc39ec1a6d2759cbc013698068278f5585
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a tutorial lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=angularjs+latest+version+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445892/normal_60236ff90dba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fe77dea84991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_605faff0cebc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_6062e9a8ce6e1.pdfIn PDF document text
    • http://slmit.fun/the_story_of_my_life_class_10_summaryhtgqr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416496/normal_6004ad40f0eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_6006fedecb4f2.pdfIn PDF document text
    • http://creditscoreusa.info/42963881463bqbh2.pdfIn PDF document text
    • http://prizinsta365.online/free_natal_chart_report_online24bzz.pdfIn PDF document text
    • http://jusapp.club/manual_codigos_de_control_universal_rca_para_tvzk6qx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fcdd6acdd18f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_9a9bd965400741eb9a92df5865bfe764.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_c67912e63f694cb18eb5502e53150702.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f705e9d-a1b7-498f-a979-b29833e72903/54654317656.pdfIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_60df6b3a592f455e90dcba71f4835952.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/miscellaneous_compounds_inorganic_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/jodonarezetivugadusi.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/cap_guidelines_idsa.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/13534981509.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_ee27acb05c6949fe9b731a56c3249681.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e5c660-44a8-45e0-ba62-e7c2bb09859f/30831672845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2c70d3-c9cb-4ecd-90a5-4d248f1cadcc/kodorugojazeb.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_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 5336 bytes
SHA-256: ead6897d45eb59a48be15e480c67f25360e7dfab1b6d112e7a9ba483cdf896bd
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 11336 bytes
SHA-256: f05cb50e964cd338d6f570b7b08a1e088cd2508c26a39db8acf8d28653500845

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