Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c9243da106a14d…

MALICIOUS

PDF

69.3 KB Created: 2021-03-20 01:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f43db139b40ee9822a995c35d25883f3 SHA-1: d8cbceda94bd100ae3ba6c7a679de0ce47cfa2db SHA-256: e1c9243da106a14db8c8747e2f821c611f5e29021f099330699dd5e8d0bfdbe3
156 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 high likelihood of malicious intent. The document contains a large number of external links, many of which point to PDF files hosted on suspicious domains, suggesting a link farm or redirection mechanism. The presence of external URIs and a PDF link farm heuristic indicates the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=cause+and+effect+worksheets+4th+grade+pdf
    • http://alcexpress3.xyz/rudorefafobufobega49avx.pdf
    • https://cdn.sqhk.co/jaguwubax/h0NwBha/98817893676.pdf
    • http://helplnstagramcontact6088757.com/tavigaxasugosuzowarakoi1wri.pdf
    • https://cdn.sqhk.co/nizekidido/jjTjigd/tempest_pirate_action_rpg_apk_free_download.pdf
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/3931151.pdf
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/jazuz_ladeg.pdf
    • https://cdn.sqhk.co/valujoper/hH2jawa/stress_ball_exercise_benefits.pdf
    • https://cdn.sqhk.co/zozijawutuxu/ggjiejI/88796949845.pdf
    • https://tevipane.weebly.com/uploads/1/3/2/6/132681072/jikotep_xodujonosital_dunuvoduj_zimazep.pdf
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdf
    • https://mivezosikobo.weebly.com/uploads/1/3/1/4/131453246/67dd38c3bb9.pdf
    • https://cdn.sqhk.co/dugelabomaw/ihiRphj/vuzegamofedopofepe.pdf
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/fugivagavugobumisu.pdf
    • https://cdn.sqhk.co/goberirud/eniihfc/gt_racing_chained_car_stunts_off_road.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5323a5ee-42ef-4c05-b4a5-2cd1f0eeb58f/71502834869.pdf
    • https://s3.amazonaws.com/rogugagatuf/62368279827.pdf
    • https://s3.amazonaws.com/xilasisefi/apc_smart-_ups_sc_1000_software.pdf
    • https://uploads.strikinglycdn.com/files/33ac4330-ff38-4dc2-b0c9-aef3e7674827/tavunegigefojezen.pdf
    • https://uploads.strikinglycdn.com/files/a93db43c-9692-45b8-8439-91c42e4825c5/what_is_a_complete_subject_sentence.pdf
    • https://s3.amazonaws.com/jexijer/bol_chudiya_bole_kangana.pdf
    • https://uploads.strikinglycdn.com/files/3a736bc5-e89d-448d-bf7a-67beb62d3ec5/will_ps4_gta_v_work_on_ps5.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_off0000d144.bin
00baa17e7eca7c0dc1b6a17087e54145e1f7efbe1952da0f26cdbda53501e602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 5532 bytes
font_01_sfnt_off0000e42f.bin
8f8a2a0ba59ac59dbb05001400fa083f57926af335d1822308e7fe30ce36daac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 10376 bytes

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