Malicious PDF — malware analysis report

Static analysis result for SHA-256 100c6e846116469a…

MALICIOUS

PDF

74.4 KB Created: 2021-06-03 13:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b665fec7c678b28b38c80b0df13e8310 SHA-1: 42b05ffa5ad6c0aab4b045520a6f7692301fda46 SHA-256: 100c6e846116469a8c38c97a8b912917319a2768cb6da7181494af7ad618fae1
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 0.9992

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=how+to+calculate+compound+interest+on+a+loan+monthly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5fdad7c3ea3dc.pdfIn PDF document text
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/b14983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fedfac2b540c.pdfIn PDF document text
    • https://sarisiwubaj.weebly.com/uploads/1/3/0/7/130739508/risetivebasokivinof.pdfIn PDF document text
    • https://sopinukinofov.weebly.com/uploads/1/3/4/7/134767260/4908709.pdfIn PDF document text
    • https://boboxike.weebly.com/uploads/1/3/2/7/132710801/06e091ab5ad.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/848c99d2311.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/db4b409d-c875-4926-b5a3-eb71619f00d0/bluedio_turbine_headphones_language_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5b43c2-eae2-48da-9528-10c94f280c3d/rapaxumepipowim.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144543522/portable_anti_tank_guided_missile.pdfIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144555474/thakurmar_jhuli_bangla_cartoon_download_mp4.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/what_are_the_types_of_flower_arrangement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c658432f-81de-472b-8633-5786ffa6a945/64547920739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d89be52-7399-4dfc-b44a-05a08a0d41c7/que_es_un_derechos_humanos_definicion_para_nios.pdfIn PDF document text
    • http://zilebunod.pbworks.com/w/file/fetch/144424893/musukadubumote.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/9.2_naming_and_writing_formulas_for_ionic_compounds_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548c20a7-8237-4f2d-af6e-01dd53fedfe9/86422098650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8245ce9d-2cb9-4dd0-91d4-13f6ace77899/11268788655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab794f1-3f0e-4c91-b5e5-69b593594bf5/the_secret_garden_1993_rotten_tomatoes.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/f/how_to_change_time_on_keurig_k_duo_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375ddfa4-bd1d-4a67-a12f-10337b3a6c29/explain_the_difference_between_bacteria_viruses_fungi_and_parasites.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/what_year_4l60e_will_interchange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d139a8-b0b6-4529-ac98-d507efca63c6/que_es_una_imagen_artistica_definicion.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 5468 bytes
SHA-256: e9d0b736e604902ae96823a467e5f042e17c31310471c1f6c47af66a975b1525
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 11300 bytes
SHA-256: 616c8fc756bf831677eee3af97c27c8cb1669b0630a75313740f6e30ffdf3449