Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae664ee37db69e4…

MALICIOUS

PDF

75.1 KB Created: 2021-06-02 13:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fd65109fa798ab7302ee170eb00e0b76 SHA-1: 7c32102f6ffee09dbe0ce0aeddd3e4708acbb101 SHA-256: 1ae664ee37db69e4f33a42d5b90ca533d5982b4fdeb2801b9fbdca89b9d31cd8
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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites.

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
  • 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://wastran.ru/pbw?utm_term=2006+audi+s4+cabriolet+owners+manual PDF link annotation
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/421957.pdfIn PDF document text
    • https://sawobefuridavo.weebly.com/uploads/1/3/4/8/134895752/cb43f1.pdfIn PDF document text
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/1244436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463034/normal_5fe38f22ad88d.pdfIn PDF document text
    • https://tusogakesi.weebly.com/uploads/1/3/4/6/134661960/baab01e7217d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366009/normal_6006b853e6b03.pdfIn PDF document text
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/68f10df4c4.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://rorazokazog.pbworks.com/f/suvenarudixadejorijomaled.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144496926/6740991606.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/f/9265279673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6a0f26-2038-4dae-97d3-56952eaf04f8/red_storm_rising_game.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412404/kaletajoruduwaxotekego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e5f332-b944-4ade-b6e2-4a862543d664/prince_of_persia_old_game_download.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144461865/26187547245.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144442578/annual_performance_reviews_sample_comments_positive_and_negative.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/xofujabijabogukupitak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b206772f-b030-4665-bb9d-a8c9e06882e2/37720206896.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144412833/calculo_diferencial_conamat_solucionario_capitulo_1.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144424791/ill_be_on_my_way_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2c9914-7f0e-48a5-aba7-cdfbbe0b1549/58070431323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8008112c-67aa-4cfd-a114-53f8dde4796a/92005403442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8f2a2f-7635-4688-823a-276b748965f1/finite_element_method_chandrupatla_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d92136d-460b-4c5b-98f4-6f4b64ac96ce/jomupagegiwetinazaxivi.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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 5620 bytes
SHA-256: 8389874689d2516b2c4dc8de6ad9314b12cad46faf52f4213a1797201d22fbbf
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10136 bytes
SHA-256: f4ea1172f4fda23b1e5913a7312a3fb8d4d586c8ab64ecf04bbaefb9ff103046
font_02_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3