Malicious PDF — malware analysis report

Static analysis result for SHA-256 00481872d41b684e…

MALICIOUS

PDF

140.4 KB Created: 2021-03-21 11:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0323003301543b349321704f5cba339a SHA-1: 3749af347acfdef10b3a5d166428b2dbdc5b337c SHA-256: 00481872d41b684e8bd609f9ea9fedb3b954fee0bd5bb4ccbd72d4e54f494295
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=tentativa+inidonea+pdf PDF link annotation
    • https://cdn.sqhk.co/mifijizudi/gdoOWie/tujoziravelazekumukubolot.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/gfifYpf/83264436736.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/gizulifofomubipu.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/gelofizimj3vw.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/fnqgfKL/cut_up_fruit_recall_2019.pdfIn PDF document text
    • http://xefopuro.mypressonline.com/xuzapazozusapoxemarutepo.pdfIn PDF document text
    • http://mixit.info/zidibeje2i832.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/jijjhja/jusekeludonoburije.pdfIn PDF document text
    • http://secret-empire.ru/irodov_problems_in_general_physicshur9v.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/dewazewokib/licensed_specialist_in_school_psychology_texas_salary.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/how_to_clean_keurig_b70.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/quality_improvement_project_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/56917989772.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_f5db5cae3cb643aea81549a8ff76f2f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/carl_schmitt_the_concept_of_the_political.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_c66d70635d6c4e60bb1a9c19bd4231b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/obusforme_mattress_topper_reviews.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_off0001e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7D8 4736 bytes
SHA-256: 412bfbb508abec5b7548b2ea9257e66972e966758ba0e77bed65d0ed61e66034
font_01_sfnt_off0001f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F818 13304 bytes
SHA-256: 6c39e0c6dbb4ea22e8d0eb5604ba4e38010cac21abd58976c5cd8ce97ecc6bb3

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