Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79b2d54ea26a16c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-15 07:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 28183c49b4f1b54b89dbfead561b12ac SHA-1: 7d2f381973fcb72771ad9c77a3cb8af24c8ee342 SHA-256: f79b2d54ea26a16c2167c1a952575adbe531db567cdb1a2249d19f545d3a1b68
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of multiple links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to drive traffic to potentially malicious sites. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=building+and+testing+with+gradle+free+pdf In PDF document text
    • http://lirebuwoke.mygamesonline.org/66605477193.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/what_is_class_d_airspace_in_australia.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/suffixes_worksheets_grade_2.pdfIn PDF document text
    • http://juvugewit.iblogger.org/que_es_escepticismo.pdfIn PDF document text
    • http://puruzil.iblogger.org/bamcef_books.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/zikijibipujavijojote.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/modern_history_of_china_podcast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b180cad8-f876-4374-b65f-f09731dd0e13/71927151287.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/jbl_flip_5_vs_charge_4_which_is_better.pdfIn PDF document text
    • http://pitigapevede.onlinewebshop.net/reasons_why_mergers_and_acquisitions_fail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6597045-6ebd-49c3-bb6d-fc75200a765e/skaven_army_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/caller_information_us.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/marvel_super_war_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/apc_smart_ups_1500_battery_light_blinking.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_374f9884dde6433aa2d1d3e86f4a4b2b.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_06ceb1e55d9d409ca02e6ebcd37ffd2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifesu/ppt_free_templates_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72043ba6-6484-46f8-9e39-4735ae7cb036/92274579837.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/manual_de_usuario_h2o_mop_x5_en_espaol.pdfIn PDF document text
    • http://zorogeloma.epizy.com/wibevekuli.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/79602462541.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_f5cd04ed7b1a4cc09ebd61291be7491f.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_1caef0129c3a4abd966389197fef4270.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_db172964c9564c4c96d15ba3851a976f.pdf?index=trueIn PDF document text
    • http://kelamivajaw.rf.gd/karthik_calling_karthik_songs_mr_jatt.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_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 5444 bytes
SHA-256: ee9e038f58e4d52488a04fc4eab4f34c99ec2e52f7d395ddf199f382f5566efa
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 11192 bytes
SHA-256: 1f4d11c30942b44ab9c3a3adfd3a3c241d07c366bc8da419ee097cfaa621543f

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