Malicious PDF — malware analysis report

Static analysis result for SHA-256 246cfd87ddabb0db…

MALICIOUS

PDF

81.5 KB Created: 2021-03-24 03:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a658045b9fdb5e3de64f56811344133 SHA-1: ffde973ff48e79462d8bb43c1c7c13e5fc631161 SHA-256: 246cfd87ddabb0db85e8fa321d64aaf072c0c3c51cd9b9ee8d98e66842162273
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://dafemum.ru/strik?utm_term=world+history+textbooks+for+high+school PDF link annotation
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/molupovirokapex.pdfIn PDF document text
    • http://gutemirofexobu.iblogger.org/802533339.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jefjaBN/excursiones_cruceros_por_libre_mediterraneo.pdfIn PDF document text
    • http://hq-cleartv.info/how_to_calculate_weight_loss_percentage_in_exceldc040.pdfIn PDF document text
    • http://allostar.buzz/registrars_circular_no._11_of_20202eqdi.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Y7QA473/sketch_art_pencil_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/fhe3Vgi/woxirowel.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/6784140.pdfIn PDF document text
    • http://fdvsefwfrw.space/general_knowledge_quiz_and_answers_easy1qz4t.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/guwin.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/tijijado_movuvetusu_jegufavavesug.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/hOhbjhr/57353530004.pdfIn PDF document text
    • http://zusozujowumid.iblogger.org/sexakujufo.pdfIn PDF document text
    • http://fitness1.space/vaibhava_lakshmi_pooja_book_in_telugugiklu.pdfIn PDF document text
    • https://pawupakupofodav.weebly.com/uploads/1/3/5/3/135388754/f37155a803.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_ee01831599124283a4ecd54645f2086f.pdf?index=trueIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_828dd349da304c098d7fa494fa8ce30f.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_692e8a1f780a49708001e5ef8186a035.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_52c314ead4014656a604bc8ceea7c63c.pdf?index=trueIn PDF document text
    • http://mizosepalivugus.rf.gd/chasing_cars_ukulele.pdfIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_148c7d9e29a64122a3c1dd4af7aaf4fe.pdf?index=trueIn PDF document text
    • http://tekunobujolid.epizy.com/5_basic_human_needs_maslow.pdfIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_b0c13da474b14845873b5610327c73b1.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_1155bc8e2bfd43c08d7131a0fa480e93.pdf?index=trueIn PDF document text
    • http://lapekekefexe.rf.gd/21645040137.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_84ccf63fe8644fb081c1a390b53c6eba.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_e3531327b3914982a0532a33b8eb6d57.pdf?index=trueIn 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_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 5460 bytes
SHA-256: 2188ed8f09e2419399a58c5cffe2dfe67714235d9cf2e438cf2600f08407a71e
font_01_sfnt_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 10892 bytes
SHA-256: 9c88962caebd4f7be61bc16d0199451d2bb9aa7abd4faa0eaa4c001b96af6084