Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecaeae9e78a4415…

MALICIOUS

PDF

87.5 KB Created: 2021-06-14 02:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a0bb34e019e6fcc97f0f44b27a4c21a9 SHA-1: 65bca4fa22587b5ddacf1f9f037dc51431271a18 SHA-256: 3ecaeae9e78a4415b008cca155e4ae8f4d357336e2bd641eb95afca733508d3f
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure malicious intent. The presence of a 'Password-protected archive handoff' heuristic indicates the document's likely purpose is to trick users into downloading an encrypted file, which is a common tactic for evading security scans. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/pbw?utm_term=64+bit+winrar+for+windows+10 PDF link annotation
    • https://jutonigozazizeg.weebly.com/uploads/1/3/4/7/134700746/9627371.pdfIn PDF document text
    • https://bubizepanawip.weebly.com/uploads/1/3/4/4/134480996/jesijeso-bumezemun.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/wadekilix_monigizetog_tuvigumag.pdfIn PDF document text
    • https://nitelozam.weebly.com/uploads/1/3/5/3/135308565/805de13.pdfIn PDF document text
    • https://lixobanifalito.weebly.com/uploads/1/3/4/4/134443724/sigalisake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/73ec4512-79de-4a8b-a05f-fe77b93e4b8e/1282307736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8a7f1b-337c-4f6f-b77c-7a39309f278d/how_to_run_john_the_ripper_on_ubuntu.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144505149/pomano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15366f77-63af-40b9-9efb-07ac070e468a/fl_studio_plugins_free_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac9d11d-b9b6-4be6-806f-f025ee1dff31/taco_bell_menu_2020_october.pdfIn PDF document text
    • http://bidudilobofu.pbworks.com/w/file/fetch/144919461/rilatigobaxutefiterefuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865552ff-b10b-45b1-886c-bc5db6fc2a90/bluetooth_keyboard_for_apple_ipad_pro_12.9.pdfIn PDF document text
    • http://goxeguj.pbworks.com/f/3d_ppt_template_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8529fa9b-c271-4342-8b31-4fe1c217f992/puberaluzowimodumebiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf3fa10-0811-4dc7-9055-ffa39d34b5bb/is_season_2_episode_6_of_the_crown_true.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca15f17-dd39-4c17-bc30-b7e95d12135d/jukapokuxave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff51775-5f6f-450c-b518-2a93cd2e543a/how_to_adjust_howard_miller_grandfather_clock.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144464130/defavekifidepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3365a1ac-36ad-4dae-a7b4-d9180448483f/aspiracion_de_secreciones_en_nios.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/batman_arkham_knight_ps4_tips_and_tricks.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/gta_5_online_money_cheat_code_ps4_2020.pdfIn PDF document text
    • http://sisiwovad.pbworks.com/f/neraga.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012ca2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CA2 16272 bytes
SHA-256: 118fa16b6c72dbb4cd47872069695710aa477055734d1a5f2ebcbdcdfe6b1b99
font_00_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 5112 bytes
SHA-256: 968dcd27c56293f5c3cb97165d09af6166cca421ab69bd60023a97631b8145c4
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 15204 bytes
SHA-256: eadff338e1067de2c9be1bd2a4f617e9258f6bede73c0cc5d009536bf25642b9
font_03_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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