Malicious PDF — malware analysis report

Static analysis result for SHA-256 137b03d63a235b48…

MALICIOUS

PDF

74.3 KB Created: 2021-06-03 08:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7767504fc2ff2e2b684197751257a05 SHA-1: 68d6337a4e7a578646276cd6aa7efda99701dca7 SHA-256: 137b03d63a235b48ee2412eedd8dd174c0b9c224004d6aa85e72a8447a1d4d1b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, contains references to 'Firefox 64 bit windows 10 offline', suggesting a lure to download software. The presence of many external links, including one to a potentially malicious domain, supports the classification as a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=firefox+64+bit+windows+10+offline
    • https://simovisebosa.weebly.com/uploads/1/3/4/6/134649932/bivaraz.pdf
    • https://xeluluferira.weebly.com/uploads/1/3/4/2/134266649/27575.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nebapelamive.pbworks.com/w/file/fetch/144532554/whatsapp_spy_007_apk_free_download.pdf
    • http://negovijalulu.pbworks.com/f/xuwinifonugis.pdf
    • https://uploads.strikinglycdn.com/files/b389483e-ea85-4431-ba58-5972de8eb9bc/99626487664.pdf
    • https://uploads.strikinglycdn.com/files/cfbb13be-1fb2-4c4c-8c8e-529089f58eb8/differential_equations_and_linear_algebra_2nd_edition_farlow.pdf
    • https://uploads.strikinglycdn.com/files/8eaaef62-d6a7-4a49-bbd3-1c4bf53b07dd/excel_para_convertir_coordenadas_utm_a_topograficas.pdf
    • http://lomexalipele.pbworks.com/w/file/fetch/144514575/53806440371.pdf
    • https://uploads.strikinglycdn.com/files/25dbad50-27b9-439f-b7ec-50dfeecaac92/biography_book_report_rubric_4th_grade.pdf
    • http://gulisapil.pbworks.com/w/file/fetch/144419478/2399264410.pdf
    • https://uploads.strikinglycdn.com/files/9d8841ea-d918-4b87-b3d9-da44a0f5145c/leleboraw.pdf
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144487641/bipabi.pdf
    • http://xetibubib.pbworks.com/f/como_poner_trucos_en_gta_san_andreas_para_android.pdf
    • https://uploads.strikinglycdn.com/files/ea068efd-f043-4c10-8552-092d78896f3c/lactancia_materna_exclusiva_minsa.pdf
    • https://uploads.strikinglycdn.com/files/4eeec3ca-c65a-4b90-8e88-f916dca5030e/refenesovi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e6.bin
48c4842c6c4aaedef509ec550abe61e477e4eaa3c75398a46d4ab07b4eac0d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 5384 bytes
font_01_sfnt_off0000f56c.bin
d7a2b57220c126e108b96e9a9655541ae563b00bb3cfff286462397e132786e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10944 bytes

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