Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a6fe1e4b392974…

MALICIOUS

PDF

82.5 KB Created: 2021-03-20 04:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7fd4dfe3accfa9c413b895d566d8e983 SHA-1: 9f8d096021bf3d3d64f65f013ab226c0eaa498a3 SHA-256: 18a6fe1e4b3929749bb6f3ebc7493f083188fae9364f6e18e1aa07a034657c42
126 Risk Score

Malware Insights

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

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 0.9990

Heuristics 5

  • 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 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://maypoin.ru/award?keyword=health+hygiene+and+sanitation+pdf PDF link annotation
    • https://cdn.sqhk.co/nizivatitogu/ggeJcPq/dental_assistant_salary_per_hour_in_sc.pdfIn PDF document text
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/zudajepusawosodujaba.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/fghXhhr/42698047445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467030/normal_60387b7348176.pdfIn PDF document text
    • https://vibovetegaj.weebly.com/uploads/1/3/4/6/134695113/6848741.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/4hbCuhg/vamijesosudifuserajera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_60156739abee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5feed77219b16.pdfIn PDF document text
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/kewoxufovuvajemo.pdfIn PDF document text
    • http://koolmaxt.online/fovolemaxodjayg3.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/lowimibap-samakiv.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/Chehgjb/tugibor.pdfIn PDF document text
    • http://farvestnn.ru/viwuviwusano5kzk2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419633/normal_5fee61b5895f5.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/35c0f550f962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486042/normal_6002ab682a043.pdfIn PDF document text
    • http://idealicaitaly.site/948058650462ch7.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/nemefigasuro_bijimutuju_sekinatilawaw_vudoseniwilajok.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/hjgUgic/barratt_impulsiveness_scale_scoring_guide.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/43d3e0c.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/1994bf3c-fadd-48a2-bfaa-80a03e91e5f6/55566968440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271ea610-3f81-405c-9e71-c1c60ee66039/learn_arabic_app_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d1b083-911d-4bf4-b99a-91f018e42b48/what_do_the_different_lights_mean_on_fitbit_flex_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ad8ac1-b8a8-4ee0-b750-a9cd7069cfbd/present_continuous_exercises_online_primary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f54cdaa-cd98-4dc9-a658-dd6d23c53fe4/1994_ford_ranger_manual_trans_fluid.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_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 5268 bytes
SHA-256: c35b060b851daef528e602d1963f1b067791033c86aa0ef6518766aa1d48a85d
font_01_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 3120 bytes
SHA-256: 2d1c02d7faeb7dad5af5d103f135926a0d4fd4e69f3a7da8959d46cf8e88466d
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10876 bytes
SHA-256: fe44b0812ebfc9d0fd1e4b234d793d69a76dd587e798c1f001740ce13fa33eb8