Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea7c93c6a854a41…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 05:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4666775e6a24144295647a67d9480dfe SHA-1: 2b9191e7a075a0741ed38bd978962dbbde66afc8 SHA-256: eea7c93c6a854a41e8ce597158f9fc019b66c7edb350eecce916bb26d014f1f4
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=how+do+you+light+a+quadra+fire+wood+stove In PDF document text
    • http://gipogup.sportsontheweb.net/behavioral_analysis.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/10706601086.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/hp_probook_4530s_battery_price_in_bangladesh.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/55231261969.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/83924924304.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/abrsm_music_theory_syllabus.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/beatles_yesterday_tab.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/progressive_reloading_press_for_sale_south_africa.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/kodas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_2cce95f3488247c088e13a827b2e8168.pdf?index=trueIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_806988c337c8489c82a5a9614720733b.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_106d99f2651d4011b0cf49b3cc545519.pdf?index=trueIn PDF document text
    • http://kijonag.onlinewebshop.net/bus_eireann_youghal_to_cork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4cf77c-2603-485c-a336-a70eb826c3ba/how_to_build_a_tiny_house_on_wheels.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_061d72d32841407ca2e101397de06782.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_1fe8dbe5460a40ae85649b66e0fa1d8d.pdf?index=trueIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/murexeb.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_e28ea4e84e684dc5944cf6c233ebb6de.pdf?index=trueIn PDF document text
    • http://womawujun.atwebpages.com/tufufipiguvajomak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fda6ce-858c-4aec-9eba-ec87b9dc93f8/resumen_del_libro_sapo_y_sepo_inseparables.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_d0efee7f0e2f412a9b7206f2176d7603.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b678ad-b031-4bc1-bdad-942e25e540fa/sword_fighting_olympic_games.pdfIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_af4345cfccbf47ad952dff85437e77bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3374c43f-e19a-4d3b-8377-39cd66c434c8/building_construction_illustrated_ching.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_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 5512 bytes
SHA-256: bac712022d65813ed29f053e6a4407d45a37e7fe0a4e2b073da7e413f005a13d
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 10588 bytes
SHA-256: 70186f45abb6654fa14133c26c95269f02cadf8b1b3e4f8b1da87b4aa37c37c5

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