Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9d904177018482…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 23:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a76199b796412478cbb593bef1e1bfe5 SHA-1: 0a9b789c5ac85bc0a92ed04b571f6abd23a8ba0a SHA-256: 8f9d9041770184826292d1ec5110c95ea93b8f3f519a75123e44eb5a25994211
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=r+blends+worksheets+free PDF link annotation
    • http://fajufoturesu.sportsontheweb.net/sukarobileruvo.pdfIn PDF document text
    • http://moxumepavigotuf.iblogger.org/24231836581.pdfIn PDF document text
    • https://getovutiwezo.weebly.com/uploads/1/3/4/6/134696705/1849073.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374542/normal_6002d8d8a2403.pdfIn PDF document text
    • http://nudukuju.22web.org/final_fantasy_brave_exvius_global_apk.pdfIn PDF document text
    • http://mobijogizex.22web.org/realidades_1_practice_workbook_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_603c241ab1f91.pdfIn PDF document text
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/nuzekabuzop_dilabatukabawa_goworoko_tefas.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/fetinef_bitodewifezakop.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/47738948339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_604984f1d23e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_5fe68d1cc8c96.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/icd_11_online.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/mevudixudapu-jinenazovuserit-jewenepubobuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonupov.epizy.com/the_power_of_now_chapter_8_summary.pdfIn PDF document text
    • http://sugosabogakeg.rf.gd/lebarawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97636086-1938-4033-9026-26fddf906918/kuwafisititixonebidixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709d784e-337a-487b-bd8f-9c486f38b8ca/wafopezaxukedediwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9abb736-8de8-4041-a2e8-91765f750e2c/epson_2540_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd14d61-c1f2-41a9-8988-fa176cf6f87e/how_to_practice_for_motorcycle_permit_test.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/77819049687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283f5f2a-fa77-4d43-89c2-3729271f76ab/what_is_heat_exchanger_and_types.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 5088 bytes
SHA-256: 43c8113b59963dd2d3e0e47bcbf0d3b97d0773ad5244c524b44b1fae3fb360c8
font_01_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 12288 bytes
SHA-256: 27a5041fdcb39421a96cfa977afc7a9b0d48655a960bf48dff970f1d2b386332

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