Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e3985329e060be…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 00:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5584ee973daa9bf8176e569723b91882 SHA-1: 7c09ed36e2a2b815f3961bd52343d803e2b3229f SHA-256: 77e3985329e060bed3284285eae45abf1c64eee32c06bb2fd379b72008390b2c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were extracted, the presence of numerous suspicious links suggests the document's primary function is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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 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/123?utm_term=madden+18+cover+template In PDF document text
    • https://cdn.sqhk.co/pojuzijix/cYieWrU/origami_plants_and_flowers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_600b535eea760.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/gihhhTt/bixesokajoromogofijijag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_6023f4882271c.pdfIn PDF document text
    • http://warewakeb.sportsontheweb.net/zesenajeno.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/kPgdjf0/57545056556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_600de13bc1992.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ggeieie/faduwubuja.pdfIn PDF document text
    • http://rentline.pro/toyota_production_system_bookrnenl.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/gNhhwgd/93046487055.pdfIn PDF document text
    • http://junelizirigoroj.iblogger.org/adding_and_subtracting_integers_fun_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5fef6af466114.pdfIn PDF document text
    • http://tomandbxof.site/mdat_gog_reporting_area4xy6u.pdfIn PDF document text
    • http://9gusevshop.space/how_to_use_krups_air_fryer12dxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6058bf1e49ad9.pdfIn PDF document text
    • http://temilops.xyz/maravilloso_desastre_pelcula_2018ggut6.pdfIn PDF document text
    • http://rrrrkkkkk.space/placement_test_cambridgeidzhz.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/59713180482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8b1a21-1647-4988-a2b5-e721db8e432c/77384122735.pdfIn PDF document text
    • http://kutepiguzusudax.epizy.com/vubexiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7969db-e33e-4769-8b02-90c516812776/74566255350.pdfIn PDF document text
    • http://walizuwimubipof.rf.gd/xezavobav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106be06f-4fc8-4fd6-980d-49299d2c52c7/binoviromazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7708d489-a839-46ae-b005-a7ad12dd79be/96546959083.pdfIn PDF document text
    • http://jofaralufax.rf.gd/email_format_for_calling_meeting.pdfIn PDF document text
    • http://gofimegiwa.epizy.com/bastar_university_new_time_table_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e764b6b-5d32-49ad-bb32-0d571252ddef/sudexupezotizeke.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_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 5352 bytes
SHA-256: 8347839a1f51bae3e24f92224c8c91dc7713003ecf086719addeb90c57ca949a
font_01_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 10744 bytes
SHA-256: f42fe0041dfb7679eb90cf504540374897a4e16948351fda793093084d94fb9b