Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0fcddcf91816f0…

MALICIOUS

PDF

79.1 KB Created: 2021-05-02 19:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 53c016d7d56f61397d198407aa24f928 SHA-1: 23665d72cf50f6fa692998c1fb1029e6c3ba004c SHA-256: bb0fcddcf91816f0efa5a5d0c142aa07d68d3f29bb6decbd15245e20c87a7d39
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary malicious URL identified is 'https://baarspo.ru/strik?utm_term=armitron+wr165ft+set+time'. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest it is designed to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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/strik?utm_term=armitron+wr165ft+set+time PDF link annotation
    • http://liko-sneakers.com/61776733774wxhst.pdfIn PDF document text
    • http://form-copyrightservices.com/receptores_nicotinicos_n1_n2hd490.pdfIn PDF document text
    • http://shoop-fp.ru/321737364999hct3.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
    • https://uploads.strikinglycdn.com/files/3fd8c70c-71c4-4e2b-a10a-1609cd452405/30152618198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e456f961-518c-4940-94a6-4c5cd6e67ec3/poguposugik.pdfIn PDF document text
    • http://vutagefen.epizy.com/wobasizirenasizimip.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_2535a92c4bcc4f67857a00368b709b67.pdf?index=trueIn PDF document text
    • http://seviridotif.epizy.com/93734178784.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_2a692281ab4d40599a66e35200ec0b87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/466678a7-69cc-4a93-a462-256d62aad564/what_happens_if_your_license_expires_during_covid_19.pdfIn PDF document text
    • http://vobulag.rf.gd/kugamamazosifufo.pdfIn PDF document text
    • http://lazazowoj.epizy.com/16690084518.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_92e33d6e72114c7a96fe237fb66aca19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b0f966-f711-4d62-bfcc-9261614fb624/jamasonuruvopimamago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4abed6-b216-44e9-b661-3f60a5e4b8aa/how_to_program_baofeng_uv-5r_with_computer.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_4bc003d9129b43c293e935ab50136350.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d6803a-4331-4289-a3d2-6722aeee9ca8/cradlepoint_ibr600_user_manual.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_c7eca54cdfd0472186bbb0cc0135fb89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8d4005-6d78-4481-9e60-906ad2ce297f/38815842913.pdfIn PDF document text
    • http://medojowibapij.epizy.com/3252090250.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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 4872 bytes
SHA-256: 912246f3663246a7f2082ce15498c5e99c84a7fe1a3b9df4d1c2ca7c29be9643
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10804 bytes
SHA-256: 8b04161e55abf21dd7947873151bfa26c6ededb71527d82a07a6c07e91fab6dd
font_02_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3