Malicious PDF — malware analysis report

Static analysis result for SHA-256 b073bbece5964c0e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-21 02:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7c9cee0d6f6b0ddc935ef76e60eeeb92 SHA-1: bc92c9a413261e3a6adcdd22a108753d40340fed SHA-256: b073bbece5964c0ec5a3ec9d67736026beec48a5eade8b69ee4220bd68b70c4e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://soxebez.ru/award?keyword=ssc+stenographer+2020+question+paper+pdf PDF link annotation
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/6107162.pdfIn PDF document text
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/dutidarewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5fe70017ad1c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5fe26a14cf829.pdfIn PDF document text
    • http://goodshopsales.xyz/kiputat8g5r1.pdfIn PDF document text
    • http://vigastlens.xyz/376005344437r7yz.pdfIn PDF document text
    • http://goldstein.capital/nous_avons_soif_de_ta_prsencegf6l6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_5fca41d3f1975.pdfIn PDF document text
    • http://secret-empire.ru/sivukamopexurikomovuv05k3u.pdfIn PDF document text
    • http://twenty-promo2020.ru/basulagetisisopativabarwzrc1.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/1c4c33d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_dd1bc775a97845d092afa78b8e370b96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/xudamas.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_e63a5d7364584128bd3e25dc6d4edde7.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_8e6873fd21304954a61dec19e936fa19.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_0a374a4b5ad74f8c9da3b6be9dee2913.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_1e48b8438810452eaaf596fc07432872.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/kegoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/38936528914.pdfIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_05a853fe200a485bbdc993dae06969d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/vobupene.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/photo_collage_app_for_android_free.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_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 5888 bytes
SHA-256: ae237eb540b2e9d2dcd7d44c67a260f2647765cc3fcaa055112cd2f4f50dfeaf
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 11196 bytes
SHA-256: 2905cb3040478e32e58dfc05cbedc1b766dfc978b7197f2fd99ebb16bb78657d

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