Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3cefead1a06f8a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 06:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9672006e99606c4453f1615811f6345e SHA-1: 3098a9656e8725790bcb639f3a8854ba9aa79f31 SHA-256: af3cefead1a06f8a27588e3c6ad768c092a7b12864ca803bde98ce0cb917a003
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, suggests a lure related to contract formats, directing users to external links. The presence of numerous links to disposable hosting and link farms indicates a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=contract+format+between+two+parties+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451027/normal_601d8303d735b.pdfIn PDF document text
    • http://berozabekep.sportsontheweb.net/30280985366.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/6934347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fce9bdd56ada.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/6d1f52f2d7d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fee9981eb0aa.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/dsl_technology.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/ctet_answer_key_paper_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_5fd6fb593b404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_6023fd6fa10bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_60303d755bcc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_601e165bda6dd.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/jotizifime/behringer_u_phoria_umc22_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349b9d66-2764-4a9d-bd43-7626bafbe9d2/58159403567.pdfIn PDF document text
    • http://wowutuzineko.myartsonline.com/anaemia_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630fa18f-a384-4279-a79d-c7d6eca74603/sunbeam_heated_blanket_blinking_f1.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/lagu_terdiam_sepi_remix_nazia_marwiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20afcf1-497c-4570-96a8-312f59ac5866/61085934939.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/38778703666.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/82661348168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72d40f3-f89f-484a-8e07-ad48bd73db1d/53761329375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58a7f92-5a4a-4997-9e44-b04c50fd7808/d-link_dcs-932l_factory_reset.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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5404 bytes
SHA-256: 6640fb523b227d0f416cd1e8637012128c0b6edc1efd1083c6db8d96594d2655
font_01_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 10284 bytes
SHA-256: 068be4c21a3d60e37419b38886b16965f072b6be719b8906e018a907421b2cd2

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