Malicious PDF — malware analysis report

Static analysis result for SHA-256 def7111524635f41…

MALICIOUS

PDF

76.6 KB Created: 2021-03-29 16:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b204410e431aa55a0d70c37a5336fcd4 SHA-1: e0200a29ad35dfc11c3069d470fc69d7f463e882 SHA-256: def7111524635f41b99992ef344e537e9c5164357cdacc255f75c7e6cb53590b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=antisynthetase+syndrome+pdf PDF link annotation
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/abb94518d195e9.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/toxorugebexuteniji.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/tezabujumojuna.pdfIn PDF document text
    • https://kotafogora.weebly.com/uploads/1/3/4/3/134322717/340110.pdfIn PDF document text
    • http://fezedemolor.22web.org/22931973438.pdfIn PDF document text
    • http://bojidodug.iblogger.org/hamilton_beach_air_fryer_toaster_oven_instructions.pdfIn PDF document text
    • http://lngcliente.com/actiontec_mi424wr_rev_i_moca_version76dcl.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/minalugegeroto.pdfIn PDF document text
    • http://dsv-trening.ru/troy-bilt_mustang_xp_50_drive_belt_sizew0mw4.pdfIn PDF document text
    • http://stavki-na-sport.site/yamaha_rx-v671_best_settingswoj00.pdfIn PDF document text
    • http://proba7.xyz/55952322549ckdp5.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/ba898e0.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/93a68e10-7904-4c97-9233-4b725f6711f0/which_mechanical_software_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8beeb728-cac8-4187-a8e6-f79a77bc74ce/tesla_model_3_long_range_acceleration_boost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2ed97e-e130-409e-a255-960850bfd216/does_office_depot_repair_computers.pdfIn PDF document text
    • http://luxixeg.epizy.com/october_2019_calendar_template.pdfIn PDF document text
    • http://kopedox.epizy.com/air_conditioning_system_nptel.pdfIn PDF document text
    • http://lubesugoninop.epizy.com/tamoxifen_dosage_form.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/convocatoria_beca_de_permanencia_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1ed29f-8fcf-4297-9e6d-9b3653197c21/15809439342.pdfIn PDF document text
    • http://poxabeb.rf.gd/49808273996.pdfIn PDF document text
    • http://besatewu.epizy.com/acta_de_constitucin_del_proyecto_ejemplo.pdfIn PDF document text
    • http://wexoloxi.rf.gd/low_carb_diet_free.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_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 5340 bytes
SHA-256: a633204a407d07878ba3cfed4b50ad260eec9f9de4dacb9e98ac8bc1f2661b55
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10900 bytes
SHA-256: f4b566d85e6a52669d113b11aa42969d3d52e2330f017ad89264ede25efee449