Malicious PDF — malware analysis report

Static analysis result for SHA-256 e350840f9daccc78…

MALICIOUS

PDF

88.5 KB Created: 2021-03-13 16:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6eb5f583044657267bebeb6cfac8050c SHA-1: 953ea10e39c22fa42facd6065d512009cfa7cd33 SHA-256: e350840f9daccc78aa467872ea9e93fb572bda063930377816b5cd6592318da0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked PDFs. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/wix?keyword=letters+to+lily+on+how+the+world+works+pdf PDF link annotation
    • https://cdn.sqhk.co/munakuvu/s0hegjR/rojewofinoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/iI7BXRq/62739864189.pdfIn PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/1097643.pdfIn PDF document text
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/woxuzamajitolate.pdfIn PDF document text
    • https://guxovegetixewaz.weebly.com/uploads/1/3/2/3/132302910/pujekofole.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/bj6heI0/gofolosazavozaribi.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/2122686.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/nabavujivazuxoviwovi.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/0vRigij/funny_pics_to_airdrop.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/black_and_decker_bm3b_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/hdYmhct/ninja_turtles_costume_diy.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/jasovuz.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/83051612743.pdfIn PDF document text
    • https://fugurisugo.weebly.com/uploads/1/3/6/0/136086283/nijan.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/tegivuwesufudur_jogiroxelipu_tawupezusanaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/when_to_apply_for_scholarships_for_spring_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6be594-eeb0-4177-a725-c3564be1e759/66160731481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40383f9-53dd-43c9-943b-778abcd33575/difference_between_atherosclerosis_and_arteriosclerosis_in_tabular_form.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/ethnic_conflict_in_ethiopia.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/furygan_back_protector_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e084a6fd-48e6-4965-a451-d817de3e4dd3/cognitive_biases_best_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d618b4-ee73-4334-be61-1a9e9c6fe0a0/fisher_and_paykel_washing_machine_spare_parts_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d648c113-db1f-4176-80e9-d262fd768779/how_many_quarts_of_oil_does_a_2015_subaru_outback_take.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/metitavularojazuliv.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_off0001202d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 5120 bytes
SHA-256: d384ec5fe066fa66de24784920f4ed3272600127a312278dc58aa25ed11aaaab
font_01_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 10256 bytes
SHA-256: b1746d993f6709f7b3fce42cbb3ce42de7773408098382e92f90d2644757c99d