Malicious PDF — malware analysis report

Static analysis result for SHA-256 9991c3db0b0f5a79…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 15:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 355990f133cd634d8d2240928863b630 SHA-1: e66b2ff4062d380cfebcb5a7c2d072184a8ec59b SHA-256: 9991c3db0b0f5a793f94edccf307578cddb81e74a928bbd4a20460a8c61a8a78
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://resalured.ru/wix?keyword=noam+chomsky+who+rules+the+world+pdf+indonesia PDF link annotation
    • https://cdn.sqhk.co/golomamone/CThaihS/download_edge_lighting_colors_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/RjggeOy/99755464713.pdfIn PDF document text
    • https://surutadalonuta.weebly.com/uploads/1/3/1/4/131455158/267ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_603fb59f43118.pdfIn PDF document text
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/913695.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/3453481.pdfIn PDF document text
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/refaruzevuwubixed.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/3jahjTk/strawberry_shortcake_adventures_on_ice_cream_island_games.pdfIn PDF document text
    • https://bawejitomu.weebly.com/uploads/1/3/1/4/131438353/lomij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_603e519771c47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5ff2aafb28f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_605ff853cdb55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_603edab85652d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_6021aee5a3f0f.pdfIn PDF document text
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/24deeda706959ae.pdfIn PDF document text
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/jegikuxinem-nojorukegaxuza-moronuriro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_6012f782df3d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/954e0bf7-f0dd-47d2-89cb-d09384c688ae/what_is_the_polar_bear_estimated_population_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca59947a-6109-4048-beee-b8012c6802f0/jlab_go_air_true_wireless_earbuds_how_to_pair.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5620 bytes
SHA-256: b151ffb55eca35bdaa75b9445ccf8472850a8aa9033eba2ae24a80d477202a55
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 11016 bytes
SHA-256: 8dac279882fd5d0dabcf021e6e89e7a7722824602660817708fe40b782f0525e

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