Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f683e2e9dc70ad7…

MALICIOUS

PDF

82.2 KB Created: 2021-03-30 15:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1fe2cddbd9bf44ba059bd83130826c89 SHA-1: 424d2939ba97b9283ada9e18619f280016d3d614 SHA-256: 6f683e2e9dc70ad7ad59a4437df26953916b8585b341fd354818171b3b7e35ee
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious lure.

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://xezojetit.ru/wix?keyword=mario+flash+games+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474457/normal_5fdc005e45d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_603b25bb047b0.pdfIn PDF document text
    • https://cdn.sqhk.co/laratakidev/2rEyihO/anodea_judith.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6038023e3836e.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/LhiVgj1/32335125443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fee292b94b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_600293b1378bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fca82cb6895a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444630/normal_6005337291af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_603dd1be09ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_60601b3af3e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_60367a37413db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_3abf747befaa4e529ead921773022a18.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_e9690f55220e48d7afe534e13495600e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/71220634878.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/bintang_lautan_apk.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_7496b05521db40388b6e6ccd1e4c2a99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/question_answers_of_chapter_a_photograph.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/2013_chevy_impala_ltz_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/bach_prelude_cello_suite_1_guitar.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_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 5188 bytes
SHA-256: 2c21a1bc34b297248b6ad6a92e227310104a1814fb5d901eea044d17b4e97bc6
font_01_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 10352 bytes
SHA-256: 1dc06405b882315e3adea39a876b368e4669e40fb448b996e73eb1b77b8149c2

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