Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfbaa23b44f3501…

MALICIOUS

PDF

82.3 KB Created: 2021-03-26 01:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd2694ffbbb5a097506524b44d0e0812 SHA-1: 5f261bd7a5e23351509668be4909a90b543c3bee SHA-256: adfbaa23b44f35015ab56a8ef1dcfcec7acc472ebaeaef02bcc2353954d50f59
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://nipisod.ru/award?keyword=antiacidos+y+antiulcerosos+pdf PDF link annotation
    • https://bodarisijusafu.weebly.com/uploads/1/3/5/3/135383154/809b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5fca2b63f3089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5fe4f258c9cad.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/reformed_theological_seminary_online_lecturesagj9q.pdfIn PDF document text
    • http://geleostone.online/tuwevepofimamoj47bz.pdfIn PDF document text
    • http://toppiksnack.xyz/52385548672ffv8a.pdfIn PDF document text
    • https://lodovanu.weebly.com/uploads/1/3/4/4/134403978/ff318ee356f.pdfIn PDF document text
    • http://fb-pageunderreview.com/wubumet3np7w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5ff01561a20ce.pdfIn PDF document text
    • http://mattelipsticks.site/kogixb1ffw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_bb82b2298e77464481fd1ab99d4f65da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/373c74c5-0572-4930-b8cb-3f2be844e7a4/tazatotivo.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_a40c7722547d49248f7238f7ded878a0.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_2373a8f5edd0495fb30dff6e531b6769.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_5706c90d8d0d45348c3db8d02d0eeadf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c916abb-6fdc-4723-8ca3-cd57858a8e11/kibizupes.pdfIn PDF document text
    • https://00e6f838-d17c-4130-b616-1adf5f4d9bb3.filesusr.com/ugd/714321_74762f4d6c8d43389dbb543c0ab426e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/182cfc8e-7f91-4957-bd5b-ad6a141ec382/63422243418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d776d529-af24-465a-9d10-96ec0b21dba0/90474343432.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 5124 bytes
SHA-256: 3949c46e1df9a5de7c09389599195e708c673b74fdfe62b2595e6e6a858d96b3
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 15612 bytes
SHA-256: 495191dbf7b1e39c8dd62bf905b074cd0ec14ff07cc7096fee815e5283062acc
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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