Malicious PDF — malware analysis report

Static analysis result for SHA-256 459ddb33e7ce2c23…

MALICIOUS

PDF

73.0 KB Created: 2021-02-26 22:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1998576c157cf57170b1f6e869998d81 SHA-1: 772bf872e09779b021c17d6220570bb705edccd0 SHA-256: 459ddb33e7ce2c23b32bba2b3955d75d1e0d6cebb80a3fa3e97b722c273990db
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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
  • 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/123?utm_term=how+to+check+transmission+fluid+chevy+silverado PDF link annotation
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/e79dbad.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/nuvebigolegeriso.pdfIn PDF document text
    • https://kesafukiwunutab.weebly.com/uploads/1/3/4/9/134900694/fajenoxasilu.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/the_strength_training_anatomy_workout_ii_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_6006ca2f3e43e.pdfIn PDF document text
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/nogagegilopoparek.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/7538178a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subipugexenijok.rf.gd/adblock_plus_pour_chrome_android.pdfIn PDF document text
    • http://nirisibibeso.epizy.com/52629142807.pdfIn PDF document text
    • http://pigadanafoton.rf.gd/vufovabomodamuvija.pdfIn PDF document text
    • http://livirava.atwebpages.com/ensayo_sobre_la_carta_a_garcia.pdfIn PDF document text
    • http://lojiwifi.epizy.com/41313763966.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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 5540 bytes
SHA-256: cf443e6606d2d4aa5091cecd03633fd2b416fa52f034c1b9eef5d1328f239fed
font_01_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 10472 bytes
SHA-256: 7488c76cc086919ed353baa33afce0f36857a1fb0fd5d1af211afd9e95a19592

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