Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb000368f055a19…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 21:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4dcc23468f686e1e07e88117cbad9691 SHA-1: c646c357da78b28963b3e5bb3e8dbf59fedb788b SHA-256: ecb000368f055a19b0bf8c659800302750b5c09ebc1c1a9afd16ab1ff1495121
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fast+motion+apk PDF link annotation
    • http://cafegreenwichvillage.com/uploads/files/70426662698.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091116235280554.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/ladakiv.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/75556140768.pdfIn PDF document text
    • http://cocoal.com/uploads/file/23547591396.pdfIn PDF document text
    • http://packamate.com/userfiles/kugebufomexitoxarureladun.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/84706729178.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/66408642423.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/linugakowopalotokudaveg.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/77191087910.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/wijifowaseva.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/95649749318.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bejinefariveni.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/gujusax.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/zisasitazisezisidipimexal.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/kojedefon.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/romevoroketubabogix.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/9533040828.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/xabipadu.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/5213294583.pdfIn PDF document text
    • http://skomi.ru/img/files/file/32966333770.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/16482732123.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/jowopezejaka.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/baritotal.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 10204 bytes
SHA-256: 020fc37aea0e01cc4fe670ffaa19c64a864f3bd629ecba7d8bb6f2a372bf65c7
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 19092 bytes
SHA-256: 5aee1fe0971c4c1bc793aa1aaa2c95fad5d60fb6b9fcbeac4ccc4d3347bcf79e
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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