Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd58133bfda39857…

MALICIOUS

PDF

86.0 KB Created: 2021-10-10 22:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 030a0a1b7c5f9badf98ce79d6598596e SHA-1: 7851e4673828658bc66ff99715c099a3efec134a SHA-256: bd58133bfda39857f87a38bb57fcd518aac88a56b1abf0e37ac6ceb9582ccc53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a specific rule for link farms on disposable hosting and a critical ClamAV detection for phishing malware. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to potentially compromised or low-reputation domains, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://associazionemillesogni.it/userfiles/files/70274245254.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615758182bde7---57895179908.pdfIn PDF document text
    • http://apothepharma.com/upload/files/39561521842.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/tedodoviwabak.pdfIn PDF document text
    • http://mimzyonline.com/userfiles/file/38407250020.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bfa002a8ac---bodadosodarud.pdfIn PDF document text
    • http://bankerz.in/qpic/files/87927711750.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/73646439044.pdfIn PDF document text
    • http://hydrem.ru/images/file/tebaj.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/23231443083.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/34658953011.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/42273595267.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/vanuxobasir.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/lewiduponuf.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/zigoxavo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/xoxam.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/22715197617.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/61922901074.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/lubolokosisaxokuwifetuxel.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/nejomawafulozetumafor.pdfIn PDF document text
    • https://uudanbury.life/files/file/zafejub.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/81044380434.pdfIn PDF document text
    • https://latgamatniekilv.enterlivani.lv/files/file/pexagaw.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/36876742199.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/19616050567.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/vowibubezezejifimufob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cost+to+produce+a+barrel+of+oil+by+country+2019PDF 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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 18488 bytes
SHA-256: a4506186320a2ab3c4c18fe8ff81f2190b32f55dc6a0cfc53d501efdec9c9fa8
font_01_sfnt_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 11460 bytes
SHA-256: 27110441f14347520f5b3ceee840a9f844a2f5432fee6c5ab5a3494b44be7dc5
font_02_sfnt_off00013164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1