Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a0cd2f05e98ee8…

MALICIOUS

PDF

72.3 KB Created: 2021-03-23 16:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7da45065bda459cd21c18316105e5e03 SHA-1: ee6f7e4a53b5523b6d945d178255e3b6cc16dbae SHA-256: 20a0cd2f05e98ee83d8e58546b39bf0dd642aacd4de1819afc144d088d346522
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to academic materials, specifically 'Physics fifth edition giancoli answers'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=physics+fifth+edition+giancoli+answers PDF link annotation
    • https://cdn.sqhk.co/lupokuna/7geijQW/13861537503.pdfIn PDF document text
    • http://wojisub.mypressonline.com/how_do_you_know_the_difference_between_viral_and_bacterial_pneumonia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_60513e7e0bf15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426408/normal_5ff4059ebb623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_602df13217bcf.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/creative_writing_prompts_for_adults.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/azitromicina_200_mg_bula.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/sri_lankan_ethnic_conflict.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jgajciF/barber_shop_training_course.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5fc99d756e216.pdfIn PDF document text
    • https://cdn.sqhk.co/siwowoso/jexhHji/bigg_boss_13_weekend_ka_vaar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_6056c632a9900.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/vuzixofaximevetozulovi.pdfIn PDF document text
    • http://lalevuw.mypressonline.com/vulabitewadepekikanob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465274/normal_603b51f7755dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_60163697ce9a2.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/iAjg3ji/air_attack_2_apk_mod.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/aditya_hridayam_gujarati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_602e218f2f672.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/traducciones_espaol_italiano_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/NpghpRN/quiz_logo_game_level_usa_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_602afbb9d3e0a.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/66250538819.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivomijerunaz.epizy.com/4913696556.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/adt_remote_key_fob_panic_button.pdfIn PDF document text
    • http://pugobisijutefe.epizy.com/history_of_caliphate_in_islam.pdfIn PDF document text
    • http://vofebajonunif.epizy.com/97783682804.pdfIn PDF document text
    • http://xitugukunorijiw.rf.gd/the_vampire_diaries_wall_stickers.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_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 5476 bytes
SHA-256: 6ae7002383db6bbdd12d00f0152473bba4be998c4d96c9138d4dde2689818bcf
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10768 bytes
SHA-256: 8c8fad7dbcc23efff0a05681bb4d707aded84bc0e2060603ba27e2f88bb0d8a2