Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2d35ad6aeb46b4…

MALICIOUS

PDF

101.4 KB Created: 2021-04-03 00:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a3f20e058415a568d247f4eb094fca8 SHA-1: 42d2234f5d82f1bfcf286818b70b1a383804f3f7 SHA-256: ec2d35ad6aeb46b44e84576ac04cb5dfac1d97e87854da3d102bbc4f16cdbf4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO abuse for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=zoom+g1+four+manual+em+portugu%25C3%25AAs+pdf
    • https://static.s123-cdn-static.com/uploads/4490920/normal_5febf0f3c6cc8.pdf
    • http://servempieza.site/rerus0l55r.pdf
    • https://cdn.sqhk.co/tumowara/gj1Vgic/samsung_push_service_app_comments.pdf
    • https://cdn.sqhk.co/bebumila/hc4jdS6/45180775909.pdf
    • https://static.s123-cdn-static.com/uploads/4416151/normal_600286633ae0c.pdf
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5fe829bab703e.pdf
    • https://cdn.sqhk.co/japuwejede/7jggghh/ramelum.pdf
    • https://cdn.sqhk.co/zejejofe/Fhfhqjg/45836565263.pdf
    • https://cdn.sqhk.co/navimoxa/eaia7jK/hawthorn_bank_belton_mo.pdf
    • https://cdn.sqhk.co/tavanaru/ljjhfKj/tifiv.pdf
    • http://good-production11.site/how_to_download_programs_onto_raspbianvhl2x.pdf
    • http://neojust.ru/how_to_put_on_a_kirby_sentria_vacuum_belt08xtd.pdf
    • https://cdn.sqhk.co/suwapipejob/fhajbid/470_puzzles_answers.pdf
    • http://kigurumi.org/la_casa_de_bernarda_alba_resumen_por_actos_y_escenasl7jly.pdf
    • https://cdn.sqhk.co/ridijafugemi/h3iijiK/covid_19_pandemic_status_cdc.pdf
    • https://cdn.sqhk.co/dixejetafap/UaGBLjg/mabigegovoxizusoxuj.pdf
    • http://i-men.ru/simple_cast_softwaretpiuq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_156518b063cd404c9cc574d3516871e2.pdf?index=true
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_23c1d5e47bdc4c4aa3f1277f63164fe8.pdf?index=true
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_3bc1ec65ad0844e09ed5c8332c616a46.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_77fe5ec8ac0741509937531c22415db8.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_a8eb8c0ec8e7473e9111e0ee090cf019.pdf?index=true
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_e72cf30711e24127929a8d2d8a0603eb.pdf?index=true
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_57a72ae6d0de4befa7956c3fb9e30300.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_off0001266e.bin
6f6c5a8fb5e62cfd2b6ff76f758e0f05a98695d5bac735cd019a42cb5e5649ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 2952 bytes
font_01_sfnt_off000130fb.bin
375dcbb9630661f927deec23bc412f5e5915a292721efdd50193dd4551ff10c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130FB 5520 bytes
font_02_sfnt_off00014375.bin
90778f5a7961eb1112b6a4517791971ad2bd8076a666d36f364a9ce650a164db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 14788 bytes
font_03_sfnt_off00017031.bin
ca387c1c3d4f9d2334753a109aee0c02092da34b37e2fbc5f1a997f909c1bf6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17031 16164 bytes

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