Malicious PDF — malware analysis report

Static analysis result for SHA-256 b924ce11682d4e03…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 19:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8de8fb0754fba06e88481097726e83e3 SHA-1: 2132a5f3ded82ec444325302bc390b8fe517abc2 SHA-256: b924ce11682d4e0300bf748ccd05ab99bd4b349ea44d5f11b71bc6b95f444c36
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 pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=que+diferencia+hay+entre+una+imagen+jpg+y+png
    • https://lepomanorep.weebly.com/uploads/1/3/4/8/134856804/jalopetutawinutapa.pdf
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/nogekivotu.pdf
    • https://vimebadexij.weebly.com/uploads/1/3/5/2/135295776/pekudimomavuf-xusuzo-bodoxopuni.pdf
    • https://static.s123-cdn-static.com/uploads/4390382/normal_60097ad2e7dd2.pdf
    • https://cdn-cms.f-static.net/uploads/4368975/normal_6019ca8b02804.pdf
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/7181c680becbb20.pdf
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/wipiremunobaxinened.pdf
    • https://cdn-cms.f-static.net/uploads/4489969/normal_6053836757f67.pdf
    • https://cdn-cms.f-static.net/uploads/4379474/normal_604197480806c.pdf
    • https://mumamelif.weebly.com/uploads/1/3/4/4/134464597/bobafabi.pdf
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/899530.pdf
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe0b63accb44.pdf
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/9631127.pdf
    • https://cdn-cms.f-static.net/uploads/4409813/normal_6067686c9ba12.pdf
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/tozabepelakud.pdf
    • https://cdn-cms.f-static.net/uploads/4417212/normal_605fbb1573687.pdf
    • https://cdn-cms.f-static.net/uploads/4468255/normal_601db94d2d2cc.pdf
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/07ee796.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0cd4ee11-4317-455d-965f-cc621fe3c801/what_does_sharded_mean_in_lincoln_in_the_bardo.pdf
    • https://uploads.strikinglycdn.com/files/2e65ba57-6fc9-4fad-ac09-c24cd2c47bd1/aci_301-05_free_download.pdf
    • https://uploads.strikinglycdn.com/files/5ddfa9bd-3c08-4c2d-94dc-317b3775c168/38268606219.pdf
    • https://uploads.strikinglycdn.com/files/1399894d-f1ef-4e47-9601-a8cf4423fd84/buwawokogi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee20.bin
e15d32cb6c0ca9aeb4ed64b92084148516c474ef1e71c7cd74108f0252853e40
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5596 bytes
font_01_sfnt_off00010108.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 1800 bytes
font_02_sfnt_off00010996.bin
1517f3dd56f4f1345cfce543d30c98e1ae0007e5daca25693e6b56fb8723fcb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 12004 bytes