Malicious PDF — malware analysis report

Static analysis result for SHA-256 3081388d612d4e0b…

MALICIOUS

PDF

78.8 KB Created: 2021-03-09 01:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 438b5b5ffcf69df410ad383c3c090b40 SHA-1: 3dc9b26e4370ad5a88523fac1349ca6d36b10684 SHA-256: 3081388d612d4e0b83549f6152f48c49cc3d8edfd091497868092c977b478172
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external URLs points to a multi-stage attack where the PDF acts as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=minecraft+ultra+graphics+android
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/genibemino.pdf
    • https://vujilesozigo.weebly.com/uploads/1/3/4/0/134042384/ecdc8.pdf
    • http://c-advance.space/92972586543x2b9z.pdf
    • http://cetop.xyz/moxadaduduralivjbag.pdf
    • http://studyweb.site/sense_and_sensibility_1995_movie_online_free9ybij.pdf
    • http://guitar.su/white_wood_wallpaper_peel_and_stickone8n.pdf
    • https://dojovirofolabi.weebly.com/uploads/1/3/1/0/131069789/5375289.pdf
    • https://ruvikofaxum.weebly.com/uploads/1/3/1/3/131380889/femanupodoxaloli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gekojulog/cdc_genital_herpes_treatment_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/dae612d4-bf57-48b4-aafb-1294f0869b60/tebepetuxilazubijarikobi.pdf
    • https://s3.amazonaws.com/viwoxuz/how_is_ai_used_in_healthcare_today.pdf
    • https://s3.amazonaws.com/boxalewijim/alloys_of_copper.pdf
    • https://s3.amazonaws.com/zuponefi/magutuso.pdf
    • https://s3.amazonaws.com/napejaxosinages/independent_and_dependent_events_worksheet_answers.pdf
    • https://s3.amazonaws.com/sesafefanulokam/90904006314.pdf
    • https://s3.amazonaws.com/pajeriramal/22510047855.pdf
    • https://uploads.strikinglycdn.com/files/041dc666-73f3-48ec-9739-6d225e757254/38435728187.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/mijigagisakezavumuwajox.pdf
    • https://s3.amazonaws.com/warapagefasovi/86610998553.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73d.bin
ee993730bc0215fff9f9b5a8b3a3501c8c8eb2858dbe2b4d1326d38c55bbb469		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 5424 bytes
font_01_sfnt_off000109b6.bin
cb4b2bd39934a69ade6374311ee27bc5c66170f9e1869c9a113af57cb6a65d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 10864 bytes

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