Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf0478622d7b1c6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 21:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0a4ff42adda5a3bc4e2449a3d75e2a1 SHA-1: 3a63d1c84b0ed0b9e88ae6dd5b61d81e4c58be58 SHA-256: eaf0478622d7b1c6673a2579f882e27cfc3f8f239bb41c16b545de02946d38ee
74 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier with high confidence. It contains a large number of embedded URLs, many pointing to disposable domains, and is identified as a link farm. This suggests the document's primary purpose is to redirect users to malicious content or phishing sites, likely disguised as search results or download links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://linhngapt.vn/upload/files/47089287132.pdf In PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/folalewi.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nazegegu.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/rerovupojipisumubijorari.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/fijeli.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/didebatowunosupejukotufu.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/bineziravikutoloni.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/wavedur.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/jukefomaberafobegu.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/88954184389.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zanufoxapokat.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/zujetuvaboruwogopo.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/wawesiwapuxozi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7178eh0mnski7mj2fffihhrd00/48047502351.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/vizamiwafewuke.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/050201541575.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/np6onmbnt6uqcg4gujfdul1k74/75675911106.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/36170396608.pdfIn PDF document text
    • http://kvrhousing.com/uploads/75021911512.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/towoxukujutenabojedewiku.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/49549681571.pdfIn PDF document text
    • http://tochalco.com/uploads/files/tifukovowufazovuro.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/34932639156.pdfIn PDF document text
    • https://tl-systems.hu/files/files/52819162984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hill+climb+racing+2+downPDF link annotation
    • 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 10652 bytes
SHA-256: 1f621ee288f89a492fcb275d406ec2cf34f9c4c77b0e84ce26e728e2d01f5756
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 17444 bytes
SHA-256: f479a7eaa67543a974bc1a4e6695e704eb98baac34e468bc4dd24e0f21cd0ad9

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