Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45c8042716bc517…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 00:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 24485611e59323399a344ae65f5d1c48 SHA-1: b35597d33cafa76be61fa1caf9ad72cd3b8f8711 SHA-256: e45c8042716bc517c38ce253618f0d940c23a4b0cf961755b82eda7abd748ffb
126 Risk Score

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 0.9974

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 http://tafgambiatours.com/userfiles/file/kexisegoruxa.pdf In PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/14591790629.pdfIn PDF document text
    • https://majubesar.net/contents/files/mujawubalevabobusujijis.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/91857344302.pdfIn PDF document text
    • https://adikkedua.com/contents/files/rajodimaxibuliju.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/lededetujinulusujugo.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/97651610503.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/torakamifojodubip.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-05/5fbf8ace3443c4f91c93946ed37b3178.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/57556118381.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/zepamawo.pdfIn PDF document text
    • http://le383.com/uploads/files/nofaka.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135846febaf3---33008976787.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/disunite.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a45d18e6---75499827401.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/59364835399.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/wabinofisuvireguseva.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/66065988386.pdfIn PDF document text
    • https://betsin.org/userfiles/files/69343961389.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/gejaxisu.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/24115611788.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/95051028841.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10367352927.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/zeruto.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tukibuvamodazasedezotubak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=icewind+dale+pdf+rime+of+the+frostmaidenPDF 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_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 10920 bytes
SHA-256: ae973319790c9cadec103ff6f283a492d4a8ee542833cbba84ffd2fd48558a65
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 17768 bytes
SHA-256: e6c17bee9ba7aa5f2d297a8b0b8d61fd98d1fc0ef2130f7754aa8c8e99d0c550
font_02_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1