Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f9e65c190aeac5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 02:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ece5496b403b12008d7f96418dd91e4 SHA-1: 16f2da02eccd2dded852ecd7ee52dc65b096408d SHA-256: f9f9e65c190aeac53b2fcf3d4c6e4d0cdc3d27f331b0b1e001cf5860ead72e06
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in link farm attacks to improve SEO or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is designed to facilitate external resource access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=ge+water+softener+extended+warranty
    • http://reduslim-sito.site/what_does_seals_in_navy_seals_stand_for2q609.pdf
    • https://cdn-cms.f-static.net/uploads/4471236/normal_60145cca233f2.pdf
    • https://cdn-cms.f-static.net/uploads/4443804/normal_603e97087b01d.pdf
    • http://segwaywheelchair.ru/91695218452rz8wm.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_604b3aa9194c2.pdf
    • https://cdn-cms.f-static.net/uploads/4424645/normal_5fdc3e8510e86.pdf
    • http://probnik1313.tech/794623355724jir9.pdf
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/tuzosivawemama.pdf
    • http://marketitaly.info/tuvevifuminazakuxazufew1e5g.pdf
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/rafiwitozewoturo.pdf
    • https://panejukirid.weebly.com/uploads/1/3/1/6/131606092/9136463.pdf
    • http://filfex.ru/danedawiz9ohyn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zobuwubedak/alzheimer_s_disease_fact_sheet.pdf
    • https://s3.amazonaws.com/kibavutibeved/depuxoxigezisazasotasa.pdf
    • https://uploads.strikinglycdn.com/files/24dcfd7c-f3d1-4054-9418-477de679b7a6/creative_words_to_describe_the_sunglasses.pdf
    • https://uploads.strikinglycdn.com/files/845cf9aa-41bc-498e-9c76-12b47f7732b8/radio_shack_200_channel_pro-2037_scanner.pdf
    • https://uploads.strikinglycdn.com/files/951c2b1e-0666-4f9e-966f-a9ad5beaca49/how_to_use_the_binomial_probability_table.pdf
    • https://uploads.strikinglycdn.com/files/c9f85915-2767-4477-9d3a-4fb203a0801a/when_is_the_new_hunger_games_coming_out.pdf
    • https://uploads.strikinglycdn.com/files/d6e6f361-ba1a-42d0-bd78-2b138132e793/99106989785.pdf
    • https://s3.amazonaws.com/piradi/the_secret_language_of_birthdays_free_download.pdf
    • https://uploads.strikinglycdn.com/files/4d73a509-2e94-4d74-b927-55ecfa7cc8e5/mike_meyers_comptia_a_8th_edition_free_download.pdf
    • https://uploads.strikinglycdn.com/files/7ae4d3c4-a645-473e-930c-af5a78ccd09a/black_and_decker_quick_and_easy_food_processor_fp1445_parts.pdf
    • https://s3.amazonaws.com/rujabepifar/amoeba_sisters_video_recap_of_mutations_updated_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/e6d67543-0e49-4829-8d6d-ac012ee33edf/785143415.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbd.bin
93d2dedba336b8b28943e2c871d1f0ec34356949f3c1a7a71c799ea352fd3dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 4900 bytes
font_01_sfnt_off0000fc8d.bin
05c2cea41e285c025f63043bcde0afc032bb9262c38be8fbe050bb182577dd99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 10800 bytes
font_02_sfnt_off00012181.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 4324 bytes

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