Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ae04a69eba6e32…

MALICIOUS

PDF

86.8 KB Created: 2021-03-28 07:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3be2c78f4a15642e3a798e1d9db7a6b9 SHA-1: 5fdf2352144474cd52ad59d29d26d88c271d5309 SHA-256: 57ae04a69eba6e321f15c154cbd997aa7512fdc2d46b950d5de2a4fbfce3babd
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests a malicious intent to manipulate search results or redirect users to harmful content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or content distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/123?utm_term=fgo+summer+event+2019+farming+guide
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fce878352259.pdf
    • https://cdn.sqhk.co/muligumixe/jrnBjjL/halloween_crossword_puzzle_free.pdf
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/7859508.pdf
    • https://firiwipavixura.weebly.com/uploads/1/3/1/4/131407767/raresemojokana_duvabawuka_wukuwo_jibenesasudaji.pdf
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fd7c0a4abe73.pdf
    • https://cdn.sqhk.co/vifaduvej/bErKehg/architectural_lighting_and_acoustics.pdf
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/juzom-mifasiwi-jopobubevadega.pdf
    • https://cdn.sqhk.co/wekaradukuve/2tZgdeK/aaron_rodgers_salary_from_state_farm.pdf
    • https://gevivakeje.weebly.com/uploads/1/3/0/7/130775257/piwunagovinirajeka.pdf
    • https://cdn.sqhk.co/sisadenev/moSuNhe/marketing_plan_template_2020.pdf
    • https://cdn.sqhk.co/gowamojon/NjejeEL/rexezozeni.pdf
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/wasidigexip_ludax_tugafis.pdf
    • https://rawewarox.weebly.com/uploads/1/3/1/3/131379085/3b1d30c81b480.pdf
    • https://cdn.sqhk.co/nojebimit/hgfggih/shark_ion_f80_canadian_tire.pdf
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/3499959.pdf
    • https://cdn.sqhk.co/woberimi/fDieNid/8147285883.pdf
    • https://cdn.sqhk.co/ridasozewe/Uje8cWv/werebaxajola.pdf
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/vugipebakuzezamutiva.pdf
    • https://cdn-cms.f-static.net/uploads/4502439/normal_6056eeacaff7f.pdf
    • https://cdn.sqhk.co/janezewufaj/idnLGb7/tapuzuxusafozenod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_89bb686d824f4c50a196475f65ab5d58.pdf?index=true
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_129920b2fb7c4fbbaab14f0700dd26db.pdf?index=true
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_3c35037def634b25884ca80ebbfb9742.pdf?index=true
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_2a199fb9c5444c27a5a7092d5dfbd19d.pdf?index=true
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_68389511e0cb43218181eafac39e9957.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00a.bin
496c8d00516167a834f89d705f640d0ffe155c18f0c76d108a80aa9808626913
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 3088 bytes
font_01_sfnt_off0000fb24.bin
5cfb5f8c801576f7e68dd526985d55a2f3d9dacb9d1abd1b3b46d030f8403380
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 5692 bytes
font_02_sfnt_off00010e79.bin
39f6a6a5ccbe16260858745c8b02700758d4b0d1cdc1c0a5f9f069602a223884
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 11316 bytes
font_03_sfnt_off00013592.bin
b1005de8fc0534b778735401212a4f1e6d886e3849538f1ed38e42ad7cbd1de7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 16304 bytes