Malicious PDF — malware analysis report

Static analysis result for SHA-256 8145ab19fee68c00…

MALICIOUS

PDF

73.9 KB Created: 2021-03-07 07:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cfd250c29ade45dbfaa2ec520b7d6fb6 SHA-1: c3ea25db7d0668ccbe4c91c3e6620e9239a7b2f8 SHA-256: 8145ab19fee68c008db4ed51c5c7366bb7579c2d5c2d96ba189d3b5222ea0304
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the document body's reference to 'how do i invest in a money market fund' suggest a lure to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/award?keyword=how+do+i+invest+in+a+money+market+fund PDF link annotation
    • http://fusagawi.iblogger.org/how_much_does_school_of_rock_lessons_cost.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/hotpoint_self_cleaning_oven_symbol.pdfIn PDF document text
    • https://lakiliwurig.weebly.com/uploads/1/3/6/0/136089988/7871040.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/e25d9730470c794.pdfIn PDF document text
    • https://xogosafaxisomig.weebly.com/uploads/1/3/0/7/130739024/a44c61f3291.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/30034800154.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/614793cd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jogisav.epizy.com/givilivugugigozuxu.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/how_many_calories_are_in_10_dunkin_donuts_munchkins.pdfIn PDF document text
    • http://patikogoxuxit.epizy.com/wuzalukuwox.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_7e289d3919544e239914c92fc1d1e7dc.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_9ffca3f20a794107a5a82d5b7cca28cb.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_396284445fb849329cc6704c3b202377.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_bc467d2fd1b24af992d90c767b01552e.pdf?index=trueIn PDF document text
    • http://pakemefasimamug.epizy.com/65521869807.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_efbdf20d526f42d48a9696dd1cb5ac6e.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_1fde6a3c2744402485d94033ebef9fcc.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_a5206c725b9349349687715738d7df82.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_ec820d48fa854e1185dbee9beda27dbb.pdf?index=trueIn PDF document text
    • http://pavefobigemaxe.rf.gd/the_carpetbaggers_ebook_free.pdfIn PDF document text
    • http://jametewofifoked.rf.gd/hp_designjet_500_42-in_roll_printer_driver.pdfIn PDF document text
    • http://bizebiza.rf.gd/limites_de_funciones_trigonometricas_ejemplos_resueltos.pdfIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_48982495d1934de28437ab8412b7eb6d.pdf?index=trueIn PDF document text
    • http://vogizopenukese.epizy.com/lekezeralasalokutiki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 5180 bytes
SHA-256: 3b7f9aab5cd64926728819d340b6c0d130d6f2354437e338c02aa1cc8e6806d9
font_01_sfnt_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10820 bytes
SHA-256: 6362c23608c86b130f013a7bc091cf461093d1af2a167c9055dbd8703f55df83
font_02_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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