Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c7ef45e3ddcb5f…

MALICIOUS

PDF

84.0 KB Created: 2021-05-29 19:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 02040226acb9a15d6e4670fa751c7285 SHA-1: 3e5acf79c602f3a1c34c182192e91764d4b4d95d SHA-256: 44c7ef45e3ddcb5ff36e380548a23ecd162b5ebcb1be7e858885caade2e4aba2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The primary malicious URL identified is 'https://soxebez.ru/strik?utm_term=manual+d-link+dcs-5020l'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=manual+d-link+dcs-5020l PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493873/normal_5fff4957033b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_601e76c189df6.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/2704638.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/1305348.pdfIn PDF document text
    • https://wixufefiwu.weebly.com/uploads/1/3/4/8/134883310/de038183b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_6067850baee63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5ffe88cee3294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_605c4773aacbd.pdfIn PDF document text
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/wugunavibu_zodoguwixini_rutesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5fd6e29f186d7.pdfIn PDF document text
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/fokak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ff906f614e2b.pdfIn PDF document text
    • http://www.mydlinIn 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/dcc8dc33-1576-4045-aabb-d7bbff5a9a61/psychological_assessment_services_riverside.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf17df8-d6d8-4438-b91f-c87b3f7a5fdb/how_to_adjust_draw_weight_on_bear_brave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330e92c6-6bc1-473b-b6ba-bc014b7b9ba4/britax_pavilion_70-g3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f032612-ab36-44bb-a163-7575f1fa9f7b/tisibezil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe6e976-9534-4333-9713-cff07639c376/why_is_my_maytag_washer_not_spinning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd1c5cc-c933-4dbe-8322-2f0abed7e6b4/what_is_les_miserables_staged_concert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bb13c0-ef47-4526-ab57-9c6c77d33c15/93914859521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696f303f-35f9-4d30-b48e-4065beedab65/how_to_fix_ps4_disc_eject_issue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2f7c05-2d51-43d9-b9dc-0129724b2e95/gagudawodasubeguwexunevib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60690e93-84c7-43c0-b61b-b2a0410752d1/tenumu.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_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 5336 bytes
SHA-256: 327ffb90e805be94f200a1738554e6ce18cf6d743ad37d6c49112c912626a0cc
font_01_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 13440 bytes
SHA-256: 45112fe590d3d13676e77a45dd49829a3e6e36aac0f64d0b63a0b3857f328f7e