Malicious PDF — malware analysis report

Static analysis result for SHA-256 34eca1a713302b51…

MALICIOUS

PDF

79.5 KB Created: 2021-05-25 02:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e0bb5b7817b99cad5fed0f45cf1164a3 SHA-1: 8540631d82f112ad09ee24fc26577d4db9e6690d SHA-256: 34eca1a713302b51a8bf44de94943f6273caa19ff22ca0d1e5392957312e2e44
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URL 'https://jottigo.ru/strik?utm_term=how+to+hack+krunker+io+tampermonkey' indicates a deceptive attempt to attract users searching for hacking tools. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+to+hack+krunker+io+tampermonkey PDF link annotation
    • https://lavulujataj.weebly.com/uploads/1/3/4/5/134576306/fodatoritebos.pdfIn PDF document text
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/severe-wekozagovewapet-mowuju-vezusumuzanebir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_6067cb3423d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_6026bdda22c3a.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/gujuw-sedadedewujuto-bevuvibizirufeb.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/rilosiwe_turomijan.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/bawojodonibebak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vapite/11651984509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc0f2aa-7b36-412c-81e5-c478b248bee4/kawasikuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aeced2e-bf50-4427-85ed-c13c93450ec8/are_maytag_washing_machines_good.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/free_google_maps_driving_directions_local.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ce67c3-1589-4bf5-b43f-ab7a176eaf52/paladin_subclasses_5e_homebrew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f2b7d6-808d-4148-89f3-abb32661c39d/what_is_the_interior_angle_sum_of_a_polygon_with_21_sides.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/what_does_blinking_light_on_bryant_furnace_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/factors_affecting_test_validity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990cabc4-7a6c-4cc3-a8c7-1aeb5ded54a3/zijetamapolefixogovenonuk.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_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 5180 bytes
SHA-256: 5128df3cab71c4027167fd18838ce387023cea29230142868c0edd9357695e3e
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10964 bytes
SHA-256: 7810adf3befd122e24a896d30677d36c17aa460ffd0326466d285153078cd6c9