Malicious PDF — malware analysis report

Static analysis result for SHA-256 111738cdb2468616…

MALICIOUS

PDF

78.5 KB Created: 2021-04-01 09:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73eba0daf9605431c90dd8fb5efd8e2a SHA-1: a767fafc31d02bd19647679a24f8d8927cdaaf5d SHA-256: 111738cdb2468616e981720b532042cb87ff0d4fe19ad2065d0601932f00724a
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for malicious content. The presence of a download button lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=chikni+chameli+song++pagalworld+com
    • http://fexevewuli.mypressonline.com/behavioral_approach_in_psychology.pdf
    • http://lafowesezojo.scienceontheweb.net/lojirenulifitutigilowipo.pdf
    • http://goxivomibivufuv.mywebcommunity.org/16634833954.pdf
    • http://difipalilif.scienceontheweb.net/coordination_agility_and_speed_training_for_soccer.pdf
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5fdd742a0f81d.pdf
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fc9b4249ed3a.pdf
    • http://mibilivo.scienceontheweb.net/afasias_tipos.pdf
    • http://sojekobab.22web.org/veribuzodunegotisok.pdf
    • http://kipupera.22web.org/65544486489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/wemazun/aberdeen_city_council_blue_badge_application_form.pdf
    • https://s3.amazonaws.com/babetafaperaxov/24567060294.pdf
    • https://s3.amazonaws.com/dogazisuze/92216940987.pdf
    • http://wimarewixogax.epizy.com/cetosis_definicion.pdf
    • https://s3.amazonaws.com/dudurat/media_and_entertainment_industry_in_india_report.pdf
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_271ee051600b4dd2a2ea66956d4524a0.pdf?index=true
    • http://didajuna.rf.gd/remote_exterior_angle_theorem_worksheet_answers.pdf
    • https://s3.amazonaws.com/gotenukevepunin/f9_acca_study_material.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_4437176cdf9044ba8445528fd4ddc4da.pdf?index=true
    • http://palexibibiw.atwebpages.com/quadratic_equations_problems_and_answers.pdf
    • http://jalijoruki.atwebpages.com/how_many_carbs_in_burger_king_medium_onion_rings.pdf
    • http://guwapixagufib.rf.gd/how_to_become_a_data_science_manager.pdf
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da11.bin
1ab67d657c53820e5fbea55b1000b8e96a73539588d241ae0a874f1591444695
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 5548 bytes
font_01_sfnt_off0000ecc5.bin
9db95423a26c982d6afac51d163237d3b358c20e16ac7afbbdaf740a2de20115
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 1920 bytes
font_02_sfnt_off0000f5ec.bin
43514155c7a5ef7aff4bb3e34b590d081a5bf38e42ea7fd01463d9e94659dcf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 11104 bytes
font_03_sfnt_off00011c14.bin
83f9ebe72aec723628af09d3136edf1027ffe0b4a2c52b0591b7d92111de5db7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 3448 bytes