Malicious PDF — malware analysis report

Static analysis result for SHA-256 f983648fefdc5da3…

MALICIOUS

PDF

73.4 KB Created: 2021-03-12 02:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec9f801090020fe9becb98d33614bff6 SHA-1: a7f86fadb9fd373381385c04c3bf845e29361cd2 SHA-256: f983648fefdc5da37d3bb1df5416a5caf7fd7642b599864ad5b3084e2aee2503
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://zajinet.ru/wix?keyword=3d+flaming+text+generator PDF link annotation
    • http://swiss-gear.shop/97641136369cstv8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365607/normal_60041427d5d32.pdfIn PDF document text
    • http://jivopifavu.22web.org/2895045909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_60374eb81e09b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fee54d6c256f.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/tazukenokebavaxesaxotida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fce231355f5a.pdfIn PDF document text
    • http://cashthe.ru/uab_public_relations_degree_planszp30z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_6033ccc5a8b40.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/19307531231.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/is_code_for_brick_masonry_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_9a4946874d304680a0fea66d16abe7a4.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_b1c6485996ad4fd8aac06768ee32d398.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/amazon_audible_books.pdfIn PDF document text
    • http://dadagax.epizy.com/idiom_dictionary_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/brothers_in_arms_2_apk_obb.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/kaxadifibigajuk.pdfIn PDF document text
    • http://wexiwifobezaxi.epizy.com/84863159145.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_ab9bfed4a4c34588b468031b5ea3d2be.pdf?index=trueIn 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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5188 bytes
SHA-256: 915364c12fdafde2a661abd9c347733a168d6fcb2b8ce1be2a6356a13614def1
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 10184 bytes
SHA-256: 0725023d7411bcf6eb3d8421cf718c339e903501ab969124d6bdbd5be8d89131

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