Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc07933eaa82b186…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 12:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c6745b5151fbbf48671369ac74b0953 SHA-1: 303192c14d34bd0c0f71aded7392e238efe96b5b SHA-256: bc07933eaa82b186b2d1cd06fc9e1256f72bf280b7fa68301556b18604764c81
186 Risk Score

Malware Insights

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

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 0.9995

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://baarspo.ru/wix?keyword=writing+literature+reviews+galvan+6th+edition+pdf PDF link annotation
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/34ccd012f6b5d.pdfIn PDF document text
    • http://profapp.pro/7327418984agenc.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/marenesaneneriguvotu.pdfIn PDF document text
    • http://vidclips.design/hpe_aruba_airwave_datasheetyo6ss.pdfIn PDF document text
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/0fdf89c.pdfIn PDF document text
    • http://ontrade.top/vajujiwuxnahi9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5fd175a3256e6.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/vorodewirumimu_dafovevusajobod_niwupu_tefuvolit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_601b9a0582cbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fcb2fcd0dfed.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/independent_events_probability_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389805/normal_5ff1591828bdd.pdfIn PDF document text
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/f2d4367855bd7d3.pdfIn PDF document text
    • http://linza.media/16247969016z6rzl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powagamojij.onlinewebshop.net/humminbird_helix_5_si_gps_price.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_ced02c3f2a0e4047920e9c800035970a.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_b2bd2e782bc04dbb948fda2700a00f32.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_b9398df7f177488e91e36ddc0ffd44ff.pdf?index=trueIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_736fa7e1f0a3490da6522bd8c0c2d9c5.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_665ac0828f0a4e5982804b47183751ba.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_c226dce87c034b68a3b4d91072b106ed.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_09167c40894644879527698552ae25e6.pdf?index=trueIn 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_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 5624 bytes
SHA-256: bb890e6217320d08e8941788985ced6fcdd22644c3a0a0ad6675d0ed12cea5fe
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 11980 bytes
SHA-256: 5aee761fb5d3500fd1c409a2916a540f3d527c03a0f4c29bddc54e6382c511f7