Malicious PDF — malware analysis report

Static analysis result for SHA-256 a284257b0d6c0fb4…

MALICIOUS

PDF

72.8 KB Created: 2021-05-21 20:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a629248352a96a0d857b8c7bac7201d5 SHA-1: 2bde996fb2e3778ab0d056e66bae3b8488fbd5d8 SHA-256: a284257b0d6c0fb491efd23500990f6bcacf4884a7e7c19dbb4813faa1c20b02
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to SEO-optimized content farms. One prominent URL, 'https://resalured.ru/strik?utm_term=pogil+activities+for+high+school+biology+answers+mitosis', suggests a phishing or malicious redirection attempt disguised as search results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=pogil+activities+for+high+school+biology+answers+mitosis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60157ea50d018.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/5ff594563c608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fd79c6db9e27.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/1931696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_5fd09cc280519.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/tezadokomese.pdfIn PDF document text
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/mijus_dikodofuna.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/f789db24-b5be-4d39-b3b8-3f6a1f327155/sugevevif.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/resumen_de_la_obra_el_si_de_las_nias_por_escenas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52c4c19-3c32-4bd6-b400-5844843a4e11/how_do_you_light_a_quadra_fire_gas_stove.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/domingo_leyba_scouting_report.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/fusemabawuvuxixuxuweru.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/alone_together_tagalog_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b071bc94-c195-4594-8c36-068093f52abc/2015_jeep_grand_cherokee_4_wheel_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/96981227069.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/5783098450.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/research_culminating_activity_curriculum_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f072dc-06c0-4a8a-9055-f6863502d48b/dungeons_and_dragons_trove.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 5688 bytes
SHA-256: dc9e654502566442267d5d0ef5d0816a6ae3fcb8053c584b66d3893b2f9c02ec
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10064 bytes
SHA-256: 3a577777d568df8a4b8d01ebd5b733c0f6dc8fcc3352ecebc2d724de6d7d3154

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