Malicious PDF — malware analysis report

Static analysis result for SHA-256 4676b2ce22e13a85…

MALICIOUS

PDF

72.3 KB Created: 2021-03-14 21:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ebb5b479642a43ec523df25158d29de SHA-1: 8435a6e5bf4c0c3b4f7396ae459204649135a725 SHA-256: 4676b2ce22e13a85131ec9a321523db5c2468cbbeee8c58ca2536c792be83864
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 https://soxebez.ru/wix?keyword=graco+forever+car+seat+installation+rear+facing PDF link annotation
    • http://akmurzina.com/icamera_1000_setupbxrqd.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/bidaxodepowixigupag.pdfIn PDF document text
    • http://masterpowerpoint.com/amaze_file_manager_cracked_apk4mihe.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/hc_05_bluetooth_module_working.pdfIn PDF document text
    • http://rebituzugofebo.22web.org/dukazalutizuwaki.pdfIn PDF document text
    • http://gojoges.iblogger.org/dufusunekojadomu.pdfIn PDF document text
    • http://flathead.us/gamp_5_guide02zyp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofodubelo.rf.gd/80860686481.pdfIn PDF document text
    • http://xosezokozonino.epizy.com/a_cuanto_equivale_un_metro_cuadrado_yahoo.pdfIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_760816762dad4f23929dca0bb97b5eb4.pdf?index=trueIn PDF document text
    • http://pijedawometuzov.epizy.com/peerless_transaxle_model_206-545c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb151118-a4f3-40ad-afcf-1361157f4907/91219736374.pdfIn PDF document text
    • http://judafigot.rf.gd/19663485743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced21487-7552-49c0-96a4-92578adfea9e/95124177923.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_b745e44c81e946d8a7633d6cae16b08d.pdf?index=trueIn PDF document text
    • http://kabalobolotev.rf.gd/preterite_and_imperfect_tenses_compared_worksheet_answers.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 5140 bytes
SHA-256: b80ae8545601f16aa8753d9f55ec67ec457c6cd5067a561d492c4aeab4c9d9ef
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10124 bytes
SHA-256: 58f332f5b17aec081db5130748508c98dcc78146bf6b571c9bb1d15400e3fb81

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