Malicious PDF — malware analysis report

Static analysis result for SHA-256 c641009a105c7acc…

MALICIOUS

PDF

79.9 KB Created: 2021-04-07 09:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98fe579d90e018f3814d7b311c8fd5ce SHA-1: 8e57915ef5515797522e00e9fbd13b190dcb3059 SHA-256: c641009a105c7acceb14f3cdfacf615b6ae4e9ec92490c4e004873dccf3a7bb4
186 Risk Score

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=music+from+spotify PDF link annotation
    • http://dutov.org/sheet_street_sherpa_blanketsqiphp.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/garebiza_basize_zuvomawodev.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/jg9lvgg/69481641959.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/S2Eii30/39885240406.pdfIn PDF document text
    • https://momiweporav.weebly.com/uploads/1/3/4/7/134745900/a184e170b7.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/firulimowobekafore51ggi.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/lavizewuzoruvow.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/fulipepuxez.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/faratujilufisodiribidabor.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/UmcZHha/10738618253.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
    • http://sidepojedava.myartsonline.com/dugamizesavere.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_e1788ef30b8c4f8da59f90555abf2b19.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_62cf926ed97b4b35accf7db2304b664c.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_d601f6fc14c144c1a09e173873731f63.pdf?index=trueIn PDF document text
    • http://tiredosutozol.atwebpages.com/vojaworewawolabafaw.pdfIn PDF document text
    • http://zavulelobawabi.onlinewebshop.net/76350862003.pdfIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_924ea930267046889b93cdf08754f9a0.pdf?index=trueIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_09b382af69624d9a82020d735cda5eaa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 4684 bytes
SHA-256: 23f774d3c344a20472917e536ff3a0ed361c76a6bf4523efb0e1765aa4452db8
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 11216 bytes
SHA-256: 65db8640b10ef31e71839779596a6d0c4e816d76a891fe34d88394c48dcfd0d0
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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