Malicious PDF — malware analysis report

Static analysis result for SHA-256 4023c55c5672b35a…

MALICIOUS

PDF

74.1 KB Created: 2021-06-12 00:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ec9cf9a902c7bc041fd8060ff4ae7c80 SHA-1: 0ef0e257defe56eea8b7e90383e2fdf0e27c1f17 SHA-256: 4023c55c5672b35a97ffdfd3e894f0f5e1d267fc29ee3f2054c3009ef2f4dc5c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to an educational exercise, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/pbw?utm_term=present+indefinite+tense+exercise+for+class+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476421/normal_5ffe6643e5fbc.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/lizilubamodizakujide.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/6b85da849.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/wudigajuzeladetanu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fca613e09d77.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
    • http://rujuboxu.pbworks.com/f/delunoluxuvopazutix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/466c6a5b-55d2-41f0-a98f-f6f1313e6c52/lonipiwivexowezuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46076f50-701c-48d0-b75a-7f47ba3b05aa/how_to_use_electrolux_perfect_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df63612-f159-48bd-8955-41d79ccb8c08/magic_tricks_books_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf822f09-758c-4805-bc60-09a27f7e96fa/vamosamuteke.pdfIn PDF document text
    • http://buvulareka.pbworks.com/w/file/fetch/145051350/mp3_juice_download_free_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c8d981-bcf9-4fe3-bea5-eb257d0f1c84/quero_ver_os_melhores_momentos_de_flamengo_e_internacional.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144607752/zozaputevab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1870d8e2-c89a-469b-95ed-ed10a25fde28/2000_polaris_scrambler_400_specs_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d8d296-9a85-4f8a-9f0f-0b9675156103/international_relations_vn_khanna_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7541ec-5fe8-4bc2-8a14-8465546c60c0/3484332366.pdfIn PDF document text
    • http://lalakabazu.pbworks.com/w/file/fetch/144879768/diablo_3_player_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81cfe06d-72e8-4da7-9873-b9ec613d0f7a/5e_small_player_races.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b0f70b-7930-4f0c-8744-b1362fffcee2/how_to_program_viper_7145v_4-button_remote.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144439665/3577262045.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 4996 bytes
SHA-256: 6557e5d8e91d42a2d9fd9ce4a38658ed76b5ac0ef51471697b8ac75c3b68934f
font_01_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 10516 bytes
SHA-256: 601c77478f8617273b3a5edd00fbab8dd6855d26319ab28481742b8987cdc315
font_02_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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