Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b17212bc0c6955…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 11:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3877ddb96bb86c4b71b7b80571143835 SHA-1: ed0f5cfa3603a756827734d7105aad65ed508f3d SHA-256: 91b17212bc0c695533c8103a7d27fe75a86f20cd3ab952381df936b483b487fc
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 0.9996

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=mahjong+village+mod+apk PDF link annotation
    • http://gufutaca6.xyz/se_hai_bisogno_di_informazioni_in_inglesebmpcv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392668/normal_5ff27a2148af1.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/popibelivim.pdfIn PDF document text
    • http://hydrofthol.space/cue_sheet_editor7hqej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_6049eebd2afa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_603e1a0d34d56.pdfIn PDF document text
    • http://mp4.design/para_que_sirve_el_jengibre_en_te_con_canelabpqrw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_6025538c34527.pdfIn PDF document text
    • http://dream-stat.ru/40258282276eoxp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_60446e117e582.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/sindrome_de_abstinencia_alcoholica_neonatal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_4a7ea1b49bb5447a8ea24d37b53c2bfe.pdf?index=trueIn PDF document text
    • http://mekofirudusem.rf.gd/hp_1320_printer_service_manual.pdfIn PDF document text
    • http://kipejefanowisu.atwebpages.com/14040547553.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_ec64cf91134a4aee94c0abaa1d42b5b7.pdf?index=trueIn PDF document text
    • http://nujugeteteda.myartsonline.com/can_i_learn_psychology_online.pdfIn PDF document text
    • http://lodiluz.rf.gd/mcsa_windows_server_2016_study_guide_exam_70-740_book.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_ff65d6ec069e439d8ef41ae95bc3d762.pdf?index=trueIn PDF document text
    • http://xofenilar.epizy.com/groove_essentials_2.0_poster.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/91901504647.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_553dc468835e41fd9b2af908fe6948b4.pdf?index=trueIn 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_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 5304 bytes
SHA-256: b2ee62de77540f85cc262581e8cfb1ff3c3f679ef485a32daa6f79c28d50e326
font_02_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 11924 bytes
SHA-256: a6e8849d73183c96b3cc6f33329b3a9a7452eb7a168431499dc8840b8f32d08e

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