Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbbb83e907c877a…

MALICIOUS

PDF

77.5 KB Created: 2021-03-31 08:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b6c6251e152c3d2bfa78473e6fa01fb SHA-1: df6a28db1b40df35d383d1595429ee7dbe762180 SHA-256: 9fbbb83e907c877ad2d17e4bebd3fb8bdf9883ef26475ceb17f22ca1f7920a07
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 6

  • 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.
  • 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://leonvi.ru/aws?utm_term=what+does+rsvp+by+a+certain+date+mean PDF link annotation
    • http://mujoxoluvisukid.getenjoyment.net/besevoxajoda.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/fbc1b.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/327e58b4c4493.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/lexozafazawibupalito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_ada5fc78019b44729b40e35c492d106f.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_3afb5eb518fd4f23a90a90196ecbca72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b54fc89-8a2a-45eb-9469-77f8decb519b/can_you_fix_a_leaky_garbage_disposal.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_3850656074ee497dbdd2b28f6144b16c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1104e659-8525-4a7a-afd8-d9c34b7eede2/55021250063.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_49bde7d19a8d480fb99b4d5fb10f5c13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ef5cbe-d494-4e00-ae35-2437c1add4af/how_to_fit_renault_megane_wiper_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8147e60-b5bf-48a5-a2dd-6442be4147c9/warerudokunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995b9730-ea18-474a-948b-d17946456021/nefatapiretow.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/tikanoxu.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_fa368145ecdc4b2192fffb41d3f0fed9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fae7df-3eb0-41a4-bb20-a9ae3fb7bf28/mbti_pie_chart_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741c4f9e-07b7-4242-bae1-483868e4de8d/wurodujivulenadokokesari.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_5ac77020c7e04978a922b17d963fc10f.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_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 5596 bytes
SHA-256: ddfac377d8fc51007b0ed8d18416e3bcb07580225fd9c0387a47547f7b9b843b
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 10844 bytes
SHA-256: 52cc1d6141c71452118e28223d5f0780ee656a9e31707a18c2e9b0ecc5b065b8

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